21010250554 has 16 divisors (see below), whose sum is σ = 32311715040. Its totient is φ = 10240639920.

The previous prime is 21010250531. The next prime is 21010250561. The reversal of 21010250554 is 45505201012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196212 + ... + 283759.

It is an arithmetic number, because the mean of its divisors is an integer number (2019482190).

Almost surely, 2^21010250554 is an apocalyptic number.

21010250554 is a deficient number, since it is larger than the sum of its proper divisors (11301464486).

21010250554 is a wasteful number, since it uses less digits than its factorization.

21010250554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480525.

The product of its (nonzero) digits is 2000, while the sum is 25.

Adding to 21010250554 its reverse (45505201012), we get a palindrome (66515451566).

The spelling of 21010250554 in words is "twenty-one billion, ten million, two hundred fifty thousand, five hundred fifty-four".