2195938121 has 4 divisors (see below), whose sum is σ = 2364856452. Its totient is φ = 2027019792.

The previous prime is 2195938097. The next prime is 2195938163. The reversal of 2195938121 is 1218395912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 658435600 + 1537502521 = 25660^2 + 39211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2195938121 is a prime.

It is a super-2 number, since 2×2195938121² = 9644288462522021282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2195938321) 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, 84459146 + ... + 84459171.

It is an arithmetic number, because the mean of its divisors is an integer number (591214113).

Almost surely, 2^2195938121 is an apocalyptic number.

It is an amenable number.

2195938121 is a deficient number, since it is larger than the sum of its proper divisors (168918331).

2195938121 is a wasteful number, since it uses less digits than its factorization.

2195938121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168918330.

The product of its digits is 38880, while the sum is 41.

The square root of 2195938121 is about 46860.8378179477. The cubic root of 2195938121 is about 1299.7905226576.

The spelling of 2195938121 in words is "two billion, one hundred ninety-five million, nine hundred thirty-eight thousand, one hundred twenty-one".