210221121001000 has 64 divisors (see below), whose sum is σ = 492478334459280. Its totient is φ = 83992566124800.

The previous prime is 210221121000983. The next prime is 210221121001013. The reversal of 210221121001000 is 100121122012.

It can be written as a sum of positive squares in 8 ways, for example, as 67054774935204 + 143166346065796 = 8188698^2 + 11965214^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118975407 + ... + 120729406.

Almost surely, 2^{210221121001000} is an apocalyptic number.

210221121001000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210221121001000 is an abundant number, since it is smaller than the sum of its proper divisors (282257213458280).

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

210221121001000 is a wasteful number, since it uses less digits than its factorization.

210221121001000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239705711 (or 239705697 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 210221121001000 its reverse (100121122012), we get a palindrome (210321242123012).

The spelling of 210221121001000 in words is "two hundred ten trillion, two hundred twenty-one billion, one hundred twenty-one million, one thousand".