21023361136 has 20 divisors (see below), whose sum is σ = 40754567632. Its totient is φ = 10506053376.

The previous prime is 21023361131. The next prime is 21023361143. The reversal of 21023361136 is 63116332012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023361131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320796 + ... + 380731.

Almost surely, 2^21023361136 is an apocalyptic number.

It is an amenable number.

21023361136 is a deficient number, since it is larger than the sum of its proper divisors (19731206496).

21023361136 is a wasteful number, since it uses less digits than its factorization.

21023361136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703408 (or 703402 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

Adding to 21023361136 its reverse (63116332012), we get a palindrome (84139693148).

The spelling of 21023361136 in words is "twenty-one billion, twenty-three million, three hundred sixty-one thousand, one hundred thirty-six".