21221032120431 has 48 divisors (see below), whose sum is σ = 33922847733120. Its totient is φ = 11694713247360.

The previous prime is 21221032120403. The next prime is 21221032120447. The reversal of 21221032120431 is 13402123012212.

It is not a de Polignac number, because 21221032120431 - 2⁷ = 21221032120303 is a prime.

It is a super-2 number, since 2×21221032120431² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221032120481) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28022596 + ... + 28769913.

It is an arithmetic number, because the mean of its divisors is an integer number (706725994440).

Almost surely, 2^{21221032120431} is an apocalyptic number.

21221032120431 is a deficient number, since it is larger than the sum of its proper divisors (12701815612689).

21221032120431 is a wasteful number, since it uses less digits than its factorization.

21221032120431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56792616 (or 56792603 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21221032120431 its reverse (13402123012212), we get a palindrome (34623155132643).

The spelling of 21221032120431 in words is "twenty-one trillion, two hundred twenty-one billion, thirty-two million, one hundred twenty thousand, four hundred thirty-one".