21082621212 has 18 divisors (see below), whose sum is σ = 53292181488. Its totient is φ = 7027540392.

The previous prime is 21082621207. The next prime is 21082621277. The reversal of 21082621212 is 21212628012.

21082621212 is a `hidden beast` number, since 2 + 10 + 8 + 2 + 621 + 21 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 292814148 + ... + 292814219.

Almost surely, 2^21082621212 is an apocalyptic number.

It is an amenable number.

21082621212 is an abundant number, since it is smaller than the sum of its proper divisors (32209560276).

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

21082621212 is a wasteful number, since it uses less digits than its factorization.

21082621212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585628377 (or 585628372 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The spelling of 21082621212 in words is "twenty-one billion, eighty-two million, six hundred twenty-one thousand, two hundred twelve".