220374408521 has 8 divisors (see below), whose sum is σ = 222348252360. Its totient is φ = 218407782528.

The previous prime is 220374408509. The next prime is 220374408533. The reversal of 220374408521 is 125804473022.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (220374408509) and next prime (220374408533).

It can be written as a sum of positive squares in 4 ways, for example, as 544708921 + 219829699600 = 23339^2 + 468860^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 220374408521 - 2¹⁴ = 220374392137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (220374408581) 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, 1743116 + ... + 1865261.

It is an arithmetic number, because the mean of its divisors is an integer number (27793531545).

Almost surely, 2^220374408521 is an apocalyptic number.

It is an amenable number.

220374408521 is a deficient number, since it is larger than the sum of its proper divisors (1973843839).

220374408521 is a wasteful number, since it uses less digits than its factorization.

220374408521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3608923.

The product of its (nonzero) digits is 107520, while the sum is 38.

The spelling of 220374408521 in words is "two hundred twenty billion, three hundred seventy-four million, four hundred eight thousand, five hundred twenty-one".