21210012001000 has 32 divisors (see below), whose sum is σ = 49631428084680. Its totient is φ = 8484004800000.

The previous prime is 21210012000949. The next prime is 21210012001063. The reversal of 21210012001000 is 10021001212.

It can be written as a sum of positive squares in 4 ways, for example, as 12343993613604 + 8866018387396 = 3513402^2 + 2977586^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

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, 10605005001 + ... + 10605007000.

Almost surely, 2^{21210012001000} is an apocalyptic number.

21210012001000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210012001000 is an abundant number, since it is smaller than the sum of its proper divisors (28421416083680).

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

21210012001000 is a wasteful number, since it uses less digits than its factorization.

21210012001000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21210012022 (or 21210012008 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21210012001000 its reverse (10021001212), we get a palindrome (21220033002212).

The spelling of 21210012001000 in words is "twenty-one trillion, two hundred ten billion, twelve million, one thousand".