21023235152 has 20 divisors (see below), whose sum is σ = 40776869280. Its totient is φ = 10500172128.

The previous prime is 21023235133. The next prime is 21023235199. The reversal of 21023235152 is 25153232012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 700178 + ... + 729585.

It is an arithmetic number, because the mean of its divisors is an integer number (2038843464).

Almost surely, 2^21023235152 is an apocalyptic number.

It is an amenable number.

21023235152 is a deficient number, since it is larger than the sum of its proper divisors (19753634128).

21023235152 is a wasteful number, since it uses less digits than its factorization.

21023235152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1430690 (or 1430684 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 21023235152 its reverse (25153232012), we get a palindrome (46176467164).

The spelling of 21023235152 in words is "twenty-one billion, twenty-three million, two hundred thirty-five thousand, one hundred fifty-two".