220521306634 has 4 divisors (see below), whose sum is σ = 330781959954. Its totient is φ = 110260653316.

The previous prime is 220521306617. The next prime is 220521306661. The reversal of 220521306634 is 436603125022.

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., 134318585025 + 86202721609 = 366495^2 + 293603^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 220521306634.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55130326657 + ... + 55130326660.

Almost surely, 2^220521306634 is an apocalyptic number.

220521306634 is a deficient number, since it is larger than the sum of its proper divisors (110260653320).

220521306634 is a wasteful number, since it uses less digits than its factorization.

220521306634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110260653319.

The product of its (nonzero) digits is 51840, while the sum is 34.

The spelling of 220521306634 in words is "two hundred twenty billion, five hundred twenty-one million, three hundred six thousand, six hundred thirty-four".