2154792121 has 8 divisors (see below), whose sum is σ = 2192087624. Its totient is φ = 2117560320.

The previous prime is 2154792119. The next prime is 2154792137. The reversal of 2154792121 is 1212974512.

It can be written as a sum of positive squares in 4 ways, for example, as 549668025 + 1605124096 = 23445^2 + 40064^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2154792121 - 2¹ = 2154792119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2154792161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55015 + ... + 85651.

It is an arithmetic number, because the mean of its divisors is an integer number (274010953).

Almost surely, 2^2154792121 is an apocalyptic number.

It is an amenable number.

2154792121 is a deficient number, since it is larger than the sum of its proper divisors (37295503).

2154792121 is a wasteful number, since it uses less digits than its factorization.

2154792121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31851.

The product of its digits is 10080, while the sum is 34.

The square root of 2154792121 is about 46419.7384848299. The cubic root of 2154792121 is about 1291.6210858107.

The spelling of 2154792121 in words is "two billion, one hundred fifty-four million, seven hundred ninety-two thousand, one hundred twenty-one".