21294837031 has 8 divisors (see below), whose sum is σ = 22942582544. Its totient is φ = 19648474560.

The previous prime is 21294837023. The next prime is 21294837097. The reversal of 21294837031 is 13073849212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21294837031 - 2³ = 21294837023 is a prime.

It is a super-2 number, since 2×21294837031² (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 (21294807031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 313665 + ... + 375466.

It is an arithmetic number, because the mean of its divisors is an integer number (2867822818).

Almost surely, 2^21294837031 is an apocalyptic number.

21294837031 is a deficient number, since it is larger than the sum of its proper divisors (1647745513).

21294837031 is a wasteful number, since it uses less digits than its factorization.

21294837031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691521.

The product of its (nonzero) digits is 72576, while the sum is 40.

The spelling of 21294837031 in words is "twenty-one billion, two hundred ninety-four million, eight hundred thirty-seven thousand, thirty-one".