1210122121 has 16 divisors (see below), whose sum is σ = 1350014400. Its totient is φ = 1077023808.

The previous prime is 1210122119. The next prime is 1210122127. The reversal of 1210122121 is 1212210121.

It is not a de Polignac number, because 1210122121 - 2¹ = 1210122119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1210122127) 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, 340170 + ... + 343708.

It is an arithmetic number, because the mean of its divisors is an integer number (84375900).

Almost surely, 2^1210122121 is an apocalyptic number.

It is an amenable number.

1210122121 is a deficient number, since it is larger than the sum of its proper divisors (139892279).

1210122121 is a wasteful number, since it uses less digits than its factorization.

1210122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4488.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1210122121 is about 34786.8095835189. The cubic root of 1210122121 is about 1065.6380847096.

Adding to 1210122121 its reverse (1212210121), we get a palindrome (2422332242).

The spelling of 1210122121 in words is "one billion, two hundred ten million, one hundred twenty-two thousand, one hundred twenty-one".