21220521674 has 8 divisors (see below), whose sum is σ = 34724490048. Its totient is φ = 9645691660.

The previous prime is 21220521599. The next prime is 21220521701. The reversal of 21220521674 is 47612502212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21220521674.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 482284562 + ... + 482284605.

It is an arithmetic number, because the mean of its divisors is an integer number (4340561256).

Almost surely, 2^21220521674 is an apocalyptic number.

21220521674 is a deficient number, since it is larger than the sum of its proper divisors (13503968374).

21220521674 is a wasteful number, since it uses less digits than its factorization.

21220521674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964569180.

The product of its (nonzero) digits is 13440, while the sum is 32.

The spelling of 21220521674 in words is "twenty-one billion, two hundred twenty million, five hundred twenty-one thousand, six hundred seventy-four".