21234032120 has 64 divisors (see below), whose sum is σ = 56077548480. Its totient is φ = 7083472896.

The previous prime is 21234032111. The next prime is 21234032129. The reversal of 21234032120 is 2123043212.

It is an interprime number because it is at equal distance from previous prime (21234032111) and next prime (21234032129).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21234032092 and 21234032101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234032129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1014449 + ... + 1035168.

It is an arithmetic number, because the mean of its divisors is an integer number (876211695).

Almost surely, 2^21234032120 is an apocalyptic number.

21234032120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21234032120 is an abundant number, since it is smaller than the sum of its proper divisors (34843516360).

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

21234032120 is a wasteful number, since it uses less digits than its factorization.

21234032120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2049672 (or 2049668 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21234032120 its reverse (2123043212), we get a palindrome (23357075332).

The spelling of 21234032120 in words is "twenty-one billion, two hundred thirty-four million, thirty-two thousand, one hundred twenty".