21084919272874 has 4 divisors (see below), whose sum is σ = 31627378909314. Its totient is φ = 10542459636436.

The previous prime is 21084919272869. The next prime is 21084919272877. The reversal of 21084919272874 is 47827291948012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11480529453849 + 9604389819025 = 3388293^2 + 3099095^2 .

It is a super-2 number, since 2×21084919272874² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21084919272877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5271229818217 + ... + 5271229818220.

Almost surely, 2^{21084919272874} is an apocalyptic number.

21084919272874 is a deficient number, since it is larger than the sum of its proper divisors (10542459636440).

21084919272874 is a wasteful number, since it uses less digits than its factorization.

21084919272874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10542459636439.

The product of its (nonzero) digits is 32514048, while the sum is 64.

The spelling of 21084919272874 in words is "twenty-one trillion, eighty-four billion, nine hundred nineteen million, two hundred seventy-two thousand, eight hundred seventy-four".