21023550054 has 128 divisors (see below), whose sum is σ = 52418150400. Its totient is φ = 6201982080.

The previous prime is 21023550049. The next prime is 21023550071. The reversal of 21023550054 is 45005532012.

It is a happy number.

21023550054 is a `hidden beast` number, since 2 + 102 + 3 + 5 + 500 + 54 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2367627 + ... + 2376489.

It is an arithmetic number, because the mean of its divisors is an integer number (409516800).

Almost surely, 2^21023550054 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21023550054, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26209075200).

21023550054 is an abundant number, since it is smaller than the sum of its proper divisors (31394600346).

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

21023550054 is a wasteful number, since it uses less digits than its factorization.

21023550054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9027 (or 9021 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The spelling of 21023550054 in words is "twenty-one billion, twenty-three million, five hundred fifty thousand, fifty-four".