2120121154 has 16 divisors (see below), whose sum is σ = 3326815800. Its totient is φ = 1012004224.

The previous prime is 2120121151. The next prime is 2120121173. The reversal of 2120121154 is 4511210212.

It can be written as a sum of positive squares in 4 ways, for example, as 1774347129 + 345774025 = 42123^2 + 18595^2 .

It is not an unprimeable number, because it can be changed into a prime (2120121151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200197 + ... + 210520.

Almost surely, 2^2120121154 is an apocalyptic number.

2120121154 is a deficient number, since it is larger than the sum of its proper divisors (1206694646).

2120121154 is a wasteful number, since it uses less digits than its factorization.

2120121154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410837.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 2120121154 is about 46044.7733624567. The cubic root of 2120121154 is about 1284.6561286715.

Adding to 2120121154 its reverse (4511210212), we get a palindrome (6631331366).

The spelling of 2120121154 in words is "two billion, one hundred twenty million, one hundred twenty-one thousand, one hundred fifty-four".