21310223140 has 96 divisors (see below), whose sum is σ = 46615887360. Its totient is φ = 8176896000.

The previous prime is 21310223131. The next prime is 21310223153. The reversal of 21310223140 is 4132201312.

It is a happy number.

It is a super-2 number, since 2×21310223140² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20275615 + ... + 20276665.

It is an arithmetic number, because the mean of its divisors is an integer number (485582160).

Almost surely, 2^21310223140 is an apocalyptic number.

21310223140 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 21310223140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23307943680).

21310223140 is an abundant number, since it is smaller than the sum of its proper divisors (25305664220).

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

21310223140 is a wasteful number, since it uses less digits than its factorization.

21310223140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493 (or 1491 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21310223140 its reverse (4132201312), we get a palindrome (25442424452).

The spelling of 21310223140 in words is "twenty-one billion, three hundred ten million, two hundred twenty-three thousand, one hundred forty".