21253213031022 has 160 divisors (see below), whose sum is σ = 54516128958720. Its totient is φ = 6062323253760.

The previous prime is 21253213031021. The next prime is 21253213031087. The reversal of 21253213031022 is 22013031235212.

21253213031022 is a `hidden beast` number, since 2 + 1 + 2 + 5 + 321 + 3 + 0 + 310 + 22 = 666.

It is a super-3 number, since 3×21253213031022³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21253213031021) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2244973933 + ... + 2244983399.

It is an arithmetic number, because the mean of its divisors is an integer number (340725805992).

Almost surely, 2^{21253213031022} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21253213031022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27258064479360).

21253213031022 is an abundant number, since it is smaller than the sum of its proper divisors (33262915927698).

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

21253213031022 is a wasteful number, since it uses less digits than its factorization.

21253213031022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12548 (or 12539 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 21253213031022 its reverse (22013031235212), we get a palindrome (43266244266234).

The spelling of 21253213031022 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred thirteen million, thirty-one thousand, twenty-two".