21077580012 has 12 divisors (see below), whose sum is σ = 49181020056. Its totient is φ = 7025860000.

The previous prime is 21077579989. The next prime is 21077580031. The reversal of 21077580012 is 21008577012.

It is a tau number, because it is divible by the number of its divisors (12).

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, 878232489 + ... + 878232512.

It is an arithmetic number, because the mean of its divisors is an integer number (4098418338).

Almost surely, 2^21077580012 is an apocalyptic number.

It is an amenable number.

21077580012 is an abundant number, since it is smaller than the sum of its proper divisors (28103440044).

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

21077580012 is a wasteful number, since it uses less digits than its factorization.

21077580012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1756465008 (or 1756465006 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 33.

The spelling of 21077580012 in words is "twenty-one billion, seventy-seven million, five hundred eighty thousand, twelve".