210121001210 has 32 divisors (see below), whose sum is σ = 379030611600. Its totient is φ = 83867973120.

The previous prime is 210121001201. The next prime is 210121001227. The reversal of 210121001210 is 12100121012.

It can be written as a sum of positive squares in 8 ways, for example, as 78592197649 + 131528803561 = 280343^2 + 362669^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 210121001191 and 210121001200.

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, 9257756 + ... + 9280424.

Almost surely, 2^210121001210 is an apocalyptic number.

210121001210 is a deficient number, since it is larger than the sum of its proper divisors (168909610390).

210121001210 is a wasteful number, since it uses less digits than its factorization.

210121001210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24626.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 210121001210 its reverse (12100121012), we get a palindrome (222221122222).

The spelling of 210121001210 in words is "two hundred ten billion, one hundred twenty-one million, one thousand, two hundred ten".