21150015431986 has 16 divisors (see below), whose sum is σ = 36616151188800. Its totient is φ = 8974546858800.

The previous prime is 21150015431983. The next prime is 21150015431989. The reversal of 21150015431986 is 68913451005112.

It is an interprime number because it is at equal distance from previous prime (21150015431983) and next prime (21150015431989).

It is not an unprimeable number, because it can be changed into a prime (21150015431983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7478787636 + ... + 7478790463.

It is an arithmetic number, because the mean of its divisors is an integer number (2288509449300).

Almost surely, 2^{21150015431986} is an apocalyptic number.

21150015431986 is a deficient number, since it is larger than the sum of its proper divisors (15466135756814).

21150015431986 is a wasteful number, since it uses less digits than its factorization.

21150015431986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14957578209.

The product of its (nonzero) digits is 259200, while the sum is 46.

The spelling of 21150015431986 in words is "twenty-one trillion, one hundred fifty billion, fifteen million, four hundred thirty-one thousand, nine hundred eighty-six".