21124442202431 has 16 divisors (see below), whose sum is σ = 21697959628800. Its totient is φ = 20556131668128.

The previous prime is 21124442202421. The next prime is 21124442202439. The reversal of 21124442202431 is 13420224442112.

It is a cyclic number.

It is not a de Polignac number, because 21124442202431 - 2³⁴ = 21107262333247 is a prime.

It is a super-2 number, since 2×21124442202431² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124442202439) 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, 52203026 + ... + 52606128.

It is an arithmetic number, because the mean of its divisors is an integer number (1356122476800).

Almost surely, 2^{21124442202431} is an apocalyptic number.

21124442202431 is a deficient number, since it is larger than the sum of its proper divisors (573517426369).

21124442202431 is a wasteful number, since it uses less digits than its factorization.

21124442202431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409558.

The product of its (nonzero) digits is 24576, while the sum is 32.

Adding to 21124442202431 its reverse (13420224442112), we get a palindrome (34544666644543).

The spelling of 21124442202431 in words is "twenty-one trillion, one hundred twenty-four billion, four hundred forty-two million, two hundred two thousand, four hundred thirty-one".