210101000121 has 16 divisors (see below), whose sum is σ = 311393908800. Its totient is φ = 140007407904.

The previous prime is 210101000113. The next prime is 210101000147. The reversal of 210101000121 is 121000101012.

It is a happy number.

It is not a de Polignac number, because 210101000121 - 2³ = 210101000113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (210101000101) 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, 1600276 + ... + 1726581.

It is an arithmetic number, because the mean of its divisors is an integer number (19462119300).

Almost surely, 2^210101000121 is an apocalyptic number.

It is an amenable number.

210101000121 is a deficient number, since it is larger than the sum of its proper divisors (101292908679).

210101000121 is a wasteful number, since it uses less digits than its factorization.

210101000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3329205 (or 3329199 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 210101000121 its reverse (121000101012), we get a palindrome (331101101133).

The spelling of 210101000121 in words is "two hundred ten billion, one hundred one million, one hundred twenty-one", and thus it is an aban number.