21444342031 has 16 divisors (see below), whose sum is σ = 26055903744. Its totient is φ = 17249959584.

The previous prime is 21444341987. The next prime is 21444342097. The reversal of 21444342031 is 13024344412.

It is a cyclic number.

It is not a de Polignac number, because 21444342031 - 2⁷ = 21444341903 is a prime.

It is a super-2 number, since 2×21444342031² (a number of 21 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 (21444342331) 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, 1248021 + ... + 1265086.

It is an arithmetic number, because the mean of its divisors is an integer number (1628493984).

Almost surely, 2^21444342031 is an apocalyptic number.

21444342031 is a deficient number, since it is larger than the sum of its proper divisors (4611561713).

21444342031 is a wasteful number, since it uses less digits than its factorization.

21444342031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2513190.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21444342031 its reverse (13024344412), we get a palindrome (34468686443).

The spelling of 21444342031 in words is "twenty-one billion, four hundred forty-four million, three hundred forty-two thousand, thirty-one".