21023032011 has 16 divisors (see below), whose sum is σ = 29658906240. Its totient is φ = 13208901120.

The previous prime is 21023032007. The next prime is 21023032073. The reversal of 21023032011 is 11023032012.

It is not a de Polignac number, because 21023032011 - 2² = 21023032007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21023032081) 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, 944505 + ... + 966506.

It is an arithmetic number, because the mean of its divisors is an integer number (1853681640).

Almost surely, 2^21023032011 is an apocalyptic number.

21023032011 is a deficient number, since it is larger than the sum of its proper divisors (8635874229).

21023032011 is a wasteful number, since it uses less digits than its factorization.

21023032011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911226.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21023032011 its reverse (11023032012), we get a palindrome (32046064023).

Subtracting from 21023032011 its reverse (11023032012), we obtain a palindrome (9999999999).

The spelling of 21023032011 in words is "twenty-one billion, twenty-three million, thirty-two thousand, eleven".