7772402421 has 24 divisors (see below), whose sum is σ = 12833346240. Its totient is φ = 4440433536.

The previous prime is 7772402411. The next prime is 7772402437. The reversal of 7772402421 is 1242042777.

It is a happy number.

It is not a de Polignac number, because 7772402421 - 2⁵ = 7772402389 is a prime.

It is a super-2 number, since 2×7772402421² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7772402411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 380845 + ... + 400733.

It is an arithmetic number, because the mean of its divisors is an integer number (534722760).

Almost surely, 2^7772402421 is an apocalyptic number.

It is an amenable number.

7772402421 is a deficient number, since it is larger than the sum of its proper divisors (5060943819).

7772402421 is a wasteful number, since it uses less digits than its factorization.

7772402421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26105 (or 26102 counting only the distinct ones).

The product of its (nonzero) digits is 43904, while the sum is 36.

The square root of 7772402421 is about 88161.2296931026. The cubic root of 7772402421 is about 1980.8507738085.

The spelling of 7772402421 in words is "seven billion, seven hundred seventy-two million, four hundred two thousand, four hundred twenty-one".