21213678525574 has 16 divisors (see below), whose sum is σ = 33370872940800. Its totient is φ = 10094689055880.

The previous prime is 21213678525553. The next prime is 21213678525581. The reversal of 21213678525574 is 47552587631212.

It is a congruent number.

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, 1158701712 + ... + 1158720019.

It is an arithmetic number, because the mean of its divisors is an integer number (2085679558800).

Almost surely, 2^{21213678525574} is an apocalyptic number.

21213678525574 is a deficient number, since it is larger than the sum of its proper divisors (12157194415226).

21213678525574 is a wasteful number, since it uses less digits than its factorization.

21213678525574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2317421955.

The product of its digits is 28224000, while the sum is 58.

The spelling of 21213678525574 in words is "twenty-one trillion, two hundred thirteen billion, six hundred seventy-eight million, five hundred twenty-five thousand, five hundred seventy-four".