7156022121 has 6 divisors (see below), whose sum is σ = 10336476410. Its totient is φ = 4770681408.

The previous prime is 7156022089. The next prime is 7156022123. The reversal of 7156022121 is 1212206517.

7156022121 is a `hidden beast` number, since 7 + 15 + 602 + 21 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7005690000 + 150332121 = 83700^2 + 12261^2 .

It is not a de Polignac number, because 7156022121 - 2⁵ = 7156022089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7156022123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 397556776 + ... + 397556793.

Almost surely, 2^7156022121 is an apocalyptic number.

It is an amenable number.

7156022121 is a deficient number, since it is larger than the sum of its proper divisors (3180454289).

7156022121 is a wasteful number, since it uses less digits than its factorization.

7156022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795113575 (or 795113572 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 7156022121 is about 84593.2746794921. The cubic root of 7156022121 is about 1927.0392396417.

Adding to 7156022121 its reverse (1212206517), we get a palindrome (8368228638).

The spelling of 7156022121 in words is "seven billion, one hundred fifty-six million, twenty-two thousand, one hundred twenty-one".