21144208980 has 24 divisors (see below), whose sum is σ = 59203785312. Its totient is φ = 5638455712.

The previous prime is 21144208979. The next prime is 21144209039. The reversal of 21144208980 is 8980244112.

It is a congruent number.

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, 176201682 + ... + 176201801.

It is an arithmetic number, because the mean of its divisors is an integer number (2466824388).

Almost surely, 2^21144208980 is an apocalyptic number.

21144208980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21144208980 is an abundant number, since it is smaller than the sum of its proper divisors (38059576332).

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

21144208980 is a wasteful number, since it uses less digits than its factorization.

21144208980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352403495 (or 352403493 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 39.

The spelling of 21144208980 in words is "twenty-one billion, one hundred forty-four million, two hundred eight thousand, nine hundred eighty".