21553408074 has 16 divisors (see below), whose sum is σ = 47025617760. Its totient is φ = 6531335760.

The previous prime is 21553408073. The next prime is 21553408109. The reversal of 21553408074 is 47080435512.

It is not an unprimeable number, because it can be changed into a prime (21553408073) 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, 163283329 + ... + 163283460.

It is an arithmetic number, because the mean of its divisors is an integer number (2939101110).

Almost surely, 2^21553408074 is an apocalyptic number.

21553408074 is an abundant number, since it is smaller than the sum of its proper divisors (25472209686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21553408074 is a wasteful number, since it uses less digits than its factorization.

21553408074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326566805.

The product of its (nonzero) digits is 134400, while the sum is 39.

The spelling of 21553408074 in words is "twenty-one billion, five hundred fifty-three million, four hundred eight thousand, seventy-four".