210120121002021 has 4 divisors (see below), whose sum is σ = 280160161336032. Its totient is φ = 140080080668012.

The previous prime is 210120121001951. The next prime is 210120121002023. The reversal of 210120121002021 is 120200121021012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210120121002021 - 2¹⁷ = 210120120870949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210120121002023) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 35020020167001 + ... + 35020020167006.

It is an arithmetic number, because the mean of its divisors is an integer number (70040040334008).

Almost surely, 2^{210120121002021} is an apocalyptic number.

It is an amenable number.

210120121002021 is a deficient number, since it is larger than the sum of its proper divisors (70040040334011).

210120121002021 is an equidigital number, since it uses as much as digits as its factorization.

210120121002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70040040334010.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 210120121002021 its reverse (120200121021012), we get a palindrome (330320242023033).

The spelling of 210120121002021 in words is "two hundred ten trillion, one hundred twenty billion, one hundred twenty-one million, two thousand, twenty-one".