210121022109 has 4 divisors (see below), whose sum is σ = 280161362816. Its totient is φ = 140080681404.

The previous prime is 210121022093. The next prime is 210121022113. The reversal of 210121022109 is 901220121012.

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 not a de Polignac number, because 210121022109 - 2⁴ = 210121022093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210121022119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35020170349 + ... + 35020170354.

It is an arithmetic number, because the mean of its divisors is an integer number (70040340704).

Almost surely, 2^210121022109 is an apocalyptic number.

It is an amenable number.

210121022109 is a deficient number, since it is larger than the sum of its proper divisors (70040340707).

210121022109 is an equidigital number, since it uses as much as digits as its factorization.

210121022109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70040340706.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 210121022109 in words is "two hundred ten billion, one hundred twenty-one million, twenty-two thousand, one hundred nine".