5156723021 has 8 divisors (see below), whose sum is σ = 5256001464. Its totient is φ = 5058385920.

The previous prime is 5156722979. The next prime is 5156723051. The reversal of 5156723021 is 1203276515.

It can be written as a sum of positive squares in 4 ways, for example, as 60762025 + 5095960996 = 7795^2 + 71386^2 .

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 5156723021 - 2¹⁴ = 5156706637 is a prime.

It is a super-2 number, since 2×5156723021² = 53183584630622732882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5156723051) 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, 224270 + ... + 246191.

It is an arithmetic number, because the mean of its divisors is an integer number (657000183).

Almost surely, 2^5156723021 is an apocalyptic number.

It is an amenable number.

5156723021 is a deficient number, since it is larger than the sum of its proper divisors (99278443).

5156723021 is a wasteful number, since it uses less digits than its factorization.

5156723021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470671.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 5156723021 is about 71810.3267016660. The cubic root of 5156723021 is about 1727.6586345792.

Adding to 5156723021 its reverse (1203276515), we get a palindrome (6359999536).

The spelling of 5156723021 in words is "five billion, one hundred fifty-six million, seven hundred twenty-three thousand, twenty-one".