21212021960 has 16 divisors (see below), whose sum is σ = 47727049500. Its totient is φ = 8484808768.

The previous prime is 21212021959. The next prime is 21212022019. The reversal of 21212021960 is 6912021212.

It can be written as a sum of positive squares in 2 ways, for example, as 20864646916 + 347375044 = 144446^2 + 18638^2 .

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, 265150235 + ... + 265150314.

Almost surely, 2^21212021960 is an apocalyptic number.

21212021960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212021960 is an abundant number, since it is smaller than the sum of its proper divisors (26515027540).

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

21212021960 is a wasteful number, since it uses less digits than its factorization.

21212021960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530300560 (or 530300556 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 21212021960 in words is "twenty-one billion, two hundred twelve million, twenty-one thousand, nine hundred sixty".