21310322313020 has 96 divisors (see below), whose sum is σ = 50298990432768. Its totient is φ = 7524902322432.

The previous prime is 21310322313011. The next prime is 21310322313029. The reversal of 21310322313020 is 2031322301312.

It is an interprime number because it is at equal distance from previous prime (21310322313011) and next prime (21310322313029).

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310322313029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31641827 + ... + 32308293.

It is an arithmetic number, because the mean of its divisors is an integer number (523947817008).

Almost surely, 2^{21310322313020} is an apocalyptic number.

21310322313020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21310322313020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25149495216384).

21310322313020 is an abundant number, since it is smaller than the sum of its proper divisors (28988668119748).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21310322313020 is a wasteful number, since it uses less digits than its factorization.

21310322313020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671859 (or 671857 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21310322313020 its reverse (2031322301312), we get a palindrome (23341644614332).

The spelling of 21310322313020 in words is "twenty-one trillion, three hundred ten billion, three hundred twenty-two million, three hundred thirteen thousand, twenty".