21151861728674 has 16 divisors (see below), whose sum is σ = 31875875269056. Its totient is φ = 10526668400400.

The previous prime is 21151861728659. The next prime is 21151861728677. The reversal of 21151861728674 is 47682716815112.

It is not an unprimeable number, because it can be changed into a prime (21151861728677) 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, 24176717 + ... + 25036320.

It is an arithmetic number, because the mean of its divisors is an integer number (1992242204316).

Almost surely, 2^{21151861728674} is an apocalyptic number.

21151861728674 is a deficient number, since it is larger than the sum of its proper divisors (10724013540382).

21151861728674 is a wasteful number, since it uses less digits than its factorization.

21151861728674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49214041.

The product of its digits is 9031680, while the sum is 59.

The spelling of 21151861728674 in words is "twenty-one trillion, one hundred fifty-one billion, eight hundred sixty-one million, seven hundred twenty-eight thousand, six hundred seventy-four".