7121636722 has 4 divisors (see below), whose sum is σ = 10682455086. Its totient is φ = 3560818360.

The previous prime is 7121636699. The next prime is 7121636833. The reversal of 7121636722 is 2276361217.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 4498250761 + 2623385961 = 67069^2 + 51219^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1780409179 + ... + 1780409182.

Almost surely, 2^7121636722 is an apocalyptic number.

7121636722 is a deficient number, since it is larger than the sum of its proper divisors (3560818364).

7121636722 is a wasteful number, since it uses less digits than its factorization.

7121636722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3560818363.

The product of its digits is 42336, while the sum is 37.

The square root of 7121636722 is about 84389.7903895963. The cubic root of 7121636722 is about 1923.9477442034.

Adding to 7121636722 its reverse (2276361217), we get a palindrome (9397997939).

The spelling of 7121636722 in words is "seven billion, one hundred twenty-one million, six hundred thirty-six thousand, seven hundred twenty-two".