21103020232021 has 32 divisors (see below), whose sum is σ = 26653385767680. Its totient is φ = 16264003751424.

The previous prime is 21103020231991. The next prime is 21103020232027. The reversal of 21103020232021 is 12023202030112.

It is not a de Polignac number, because 21103020232021 - 2⁵ = 21103020231989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21103020232021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103020232027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15068800 + ... + 16409593.

It is an arithmetic number, because the mean of its divisors is an integer number (832918305240).

Almost surely, 2^{21103020232021} is an apocalyptic number.

It is an amenable number.

21103020232021 is a deficient number, since it is larger than the sum of its proper divisors (5550365535659).

21103020232021 is a wasteful number, since it uses less digits than its factorization.

21103020232021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31478605.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21103020232021 its reverse (12023202030112), we get a palindrome (33126222262133).

The spelling of 21103020232021 in words is "twenty-one trillion, one hundred three billion, twenty million, two hundred thirty-two thousand, twenty-one".