21287037046 has 32 divisors (see below), whose sum is σ = 35389892736. Its totient is φ = 9601906600.

The previous prime is 21287037017. The next prime is 21287037133. The reversal of 21287037046 is 64073078212.

It is a super-2 number, since 2×21287037046² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 318201 + ... + 379243.

It is an arithmetic number, because the mean of its divisors is an integer number (1105934148).

Almost surely, 2^21287037046 is an apocalyptic number.

21287037046 is a deficient number, since it is larger than the sum of its proper divisors (14102855690).

21287037046 is a wasteful number, since it uses less digits than its factorization.

21287037046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61209 (or 61187 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 40.

The spelling of 21287037046 in words is "twenty-one billion, two hundred eighty-seven million, thirty-seven thousand, forty-six".