2151022121 has 16 divisors (see below), whose sum is σ = 2347925760. Its totient is φ = 1962351360.

The previous prime is 2151022109. The next prime is 2151022127. The reversal of 2151022121 is 1212201512.

It is a cyclic number.

It is not a de Polignac number, because 2151022121 - 2¹⁰ = 2151021097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 2151022121.

It is not an unprimeable number, because it can be changed into a prime (2151022127) 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, 164150 + ... + 176768.

It is an arithmetic number, because the mean of its divisors is an integer number (146745360).

Almost surely, 2^2151022121 is an apocalyptic number.

It is an amenable number.

2151022121 is a deficient number, since it is larger than the sum of its proper divisors (196903639).

2151022121 is a wasteful number, since it uses less digits than its factorization.

2151022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12944.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 2151022121 is about 46379.1129820310. The cubic root of 2151022121 is about 1290.8673775168.

Adding to 2151022121 its reverse (1212201512), we get a palindrome (3363223633).

The spelling of 2151022121 in words is "two billion, one hundred fifty-one million, twenty-two thousand, one hundred twenty-one".