21054421579 has 16 divisors (see below), whose sum is σ = 22814447040. Its totient is φ = 19357470720.

The previous prime is 21054421571. The next prime is 21054421589. The reversal of 21054421579 is 97512445012.

It is a cyclic number.

It is not a de Polignac number, because 21054421579 - 2³ = 21054421571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21054421571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51547 + ... + 211579.

It is an arithmetic number, because the mean of its divisors is an integer number (1425902940).

Almost surely, 2^21054421579 is an apocalyptic number.

21054421579 is a deficient number, since it is larger than the sum of its proper divisors (1760025461).

21054421579 is a wasteful number, since it uses less digits than its factorization.

21054421579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160230.

The product of its (nonzero) digits is 100800, while the sum is 40.

The spelling of 21054421579 in words is "twenty-one billion, fifty-four million, four hundred twenty-one thousand, five hundred seventy-nine".