210021001021000 has 64 divisors (see below), whose sum is σ = 529252922605680. Its totient is φ = 77546215756800.

The previous prime is 210021001020989. The next prime is 210021001021003. The reversal of 210021001021000 is 120100120012.

It can be written as a sum of positive squares in 8 ways, for example, as 4271984666884 + 205749016354116 = 2066878^2 + 14343954^2 .

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

It is not an unprimeable number, because it can be changed into a prime (210021001021003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8077717809 + ... + 8077743808.

Almost surely, 2^{210021001021000} is an apocalyptic number.

210021001021000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210021001021000 is an abundant number, since it is smaller than the sum of its proper divisors (319231921584680).

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

210021001021000 is a wasteful number, since it uses less digits than its factorization.

210021001021000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16155461651 (or 16155461637 counting only the distinct ones).

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

Adding to 210021001021000 its reverse (120100120012), we get a palindrome (210141101141012).

The spelling of 210021001021000 in words is "two hundred ten trillion, twenty-one billion, one million, twenty-one thousand".