21023002554 has 8 divisors (see below), whose sum is σ = 42046005120. Its totient is φ = 7007667516.

The previous prime is 21023002549. The next prime is 21023002613. The reversal of 21023002554 is 45520032012.

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

21023002554 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1751916874 + ... + 1751916885.

It is an arithmetic number, because the mean of its divisors is an integer number (5255750640).

Almost surely, 2^21023002554 is an apocalyptic number.

21023002554 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.

21023002554 is a wasteful number, since it uses less digits than its factorization.

21023002554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3503833764.

The product of its (nonzero) digits is 2400, while the sum is 24.

Adding to 21023002554 its reverse (45520032012), we get a palindrome (66543034566).

The spelling of 21023002554 in words is "twenty-one billion, twenty-three million, two thousand, five hundred fifty-four".