21205060044 has 48 divisors (see below), whose sum is σ = 56591394048. Its totient is φ = 6053813568.

The previous prime is 21205060039. The next prime is 21205060057. The reversal of 21205060044 is 44006050212.

It is a junction number, because it is equal to n+sod(n) for n = 21205059996 and 21205060023.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8427 + ... + 206109.

It is an arithmetic number, because the mean of its divisors is an integer number (1178987376).

Almost surely, 2^21205060044 is an apocalyptic number.

It is an amenable number.

21205060044 is an abundant number, since it is smaller than the sum of its proper divisors (35386334004).

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

21205060044 is a wasteful number, since it uses less digits than its factorization.

21205060044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198974 (or 198972 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The spelling of 21205060044 in words is "twenty-one billion, two hundred five million, sixty thousand, forty-four".