21234153020 has 24 divisors (see below), whose sum is σ = 44659414800. Its totient is φ = 8480767232.

The previous prime is 21234153007. The next prime is 21234153023. The reversal of 21234153020 is 2035143212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234153023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 792365 + ... + 818724.

It is an arithmetic number, because the mean of its divisors is an integer number (1860808950).

Almost surely, 2^21234153020 is an apocalyptic number.

21234153020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21234153020 is an abundant number, since it is smaller than the sum of its proper divisors (23425261780).

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

21234153020 is a wasteful number, since it uses less digits than its factorization.

21234153020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1611757 (or 1611755 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 21234153020 its reverse (2035143212), we get a palindrome (23269296232).

The spelling of 21234153020 in words is "twenty-one billion, two hundred thirty-four million, one hundred fifty-three thousand, twenty".