21553885434 has 8 divisors (see below), whose sum is σ = 43107770880. Its totient is φ = 7184628476.

The previous prime is 21553885433. The next prime is 21553885439. The reversal of 21553885434 is 43458835512.

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

21553885434 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21553885433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1796157114 + ... + 1796157125.

It is an arithmetic number, because the mean of its divisors is an integer number (5388471360).

Almost surely, 2^21553885434 is an apocalyptic number.

21553885434 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21553885434 is a wasteful number, since it uses less digits than its factorization.

21553885434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3592314244.

The product of its digits is 2304000, while the sum is 48.

The spelling of 21553885434 in words is "twenty-one billion, five hundred fifty-three million, eight hundred eighty-five thousand, four hundred thirty-four".