21321122023021 has 16 divisors (see below), whose sum is σ = 23141785955904. Its totient is φ = 19565076029184.

The previous prime is 21321122023013. The next prime is 21321122023039. The reversal of 21321122023021 is 12032022112312.

It is a cyclic number.

It is not a de Polignac number, because 21321122023021 - 2³ = 21321122023013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21321122022983 and 21321122023001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321122023081) 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, 25775115 + ... + 26589448.

It is an arithmetic number, because the mean of its divisors is an integer number (1446361622244).

Almost surely, 2^{21321122023021} is an apocalyptic number.

It is an amenable number.

21321122023021 is a deficient number, since it is larger than the sum of its proper divisors (1820663932883).

21321122023021 is a wasteful number, since it uses less digits than its factorization.

21321122023021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52365180.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21321122023021 its reverse (12032022112312), we get a palindrome (33353144135333).

The spelling of 21321122023021 in words is "twenty-one trillion, three hundred twenty-one billion, one hundred twenty-two million, twenty-three thousand, twenty-one".