10102120121 has 4 divisors (see below), whose sum is σ = 10102508544. Its totient is φ = 10101731700.

The previous prime is 10102120031. The next prime is 10102120123. The reversal of 10102120121 is 12102120101.

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 10102120121 - 2¹⁸ = 10101857977 is a prime.

It is a super-2 number, since 2×10102120121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10102120123) 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, 152165 + ... + 208226.

It is an arithmetic number, because the mean of its divisors is an integer number (2525627136).

Almost surely, 2^10102120121 is an apocalyptic number.

It is an amenable number.

10102120121 is a deficient number, since it is larger than the sum of its proper divisors (388423).

10102120121 is an equidigital number, since it uses as much as digits as its factorization.

10102120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388422.

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

Adding to 10102120121 its reverse (12102120101), we get a palindrome (22204240222).

The spelling of 10102120121 in words is "ten billion, one hundred two million, one hundred twenty thousand, one hundred twenty-one".