21234440120 has 32 divisors (see below), whose sum is σ = 47784297600. Its totient is φ = 8492565888.

The previous prime is 21234440107. The next prime is 21234440131. The reversal of 21234440120 is 2104443212.

It is a super-2 number, since 2×21234440120² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279257 + ... + 347063.

It is an arithmetic number, because the mean of its divisors is an integer number (1493259300).

Almost surely, 2^21234440120 is an apocalyptic number.

21234440120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21234440120 is an abundant number, since it is smaller than the sum of its proper divisors (26549857480).

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

21234440120 is a wasteful number, since it uses less digits than its factorization.

21234440120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75647 (or 75643 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21234440120 its reverse (2104443212), we get a palindrome (23338883332).

The spelling of 21234440120 in words is "twenty-one billion, two hundred thirty-four million, four hundred forty thousand, one hundred twenty".