21212021021000 has 96 divisors (see below), whose sum is σ = 52386054135480. Its totient is φ = 8038239408000.

The previous prime is 21212021020933. The next prime is 21212021021101. The reversal of 21212021021000 is 12012021212.

It can be written as a sum of positive squares in 4 ways, for example, as 2224232200996 + 18987788820004 = 1491386^2 + 4357498^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29018531 + ... + 29740530.

Almost surely, 2^{21212021021000} is an apocalyptic number.

21212021021000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212021021000 is an abundant number, since it is smaller than the sum of its proper divisors (31174033114480).

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

21212021021000 is a wasteful number, since it uses less digits than its factorization.

21212021021000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58759120 (or 58759087 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21212021021000 its reverse (12012021212), we get a palindrome (21224033042212).

The spelling of 21212021021000 in words is "twenty-one trillion, two hundred twelve billion, twenty-one million, twenty-one thousand".