21014531866 has 16 divisors (see below), whose sum is σ = 31771827360. Its totient is φ = 10424201040.

The previous prime is 21014531767. The next prime is 21014531893. The reversal of 21014531866 is 66813541012.

It is a happy number.

It is a super-2 number, since 2×21014531866² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82405 + ... + 220951.

It is an arithmetic number, because the mean of its divisors is an integer number (1985739210).

Almost surely, 2^21014531866 is an apocalyptic number.

21014531866 is a deficient number, since it is larger than the sum of its proper divisors (10757295494).

21014531866 is a wasteful number, since it uses less digits than its factorization.

21014531866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139149.

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 21014531866 in words is "twenty-one billion, fourteen million, five hundred thirty-one thousand, eight hundred sixty-six".