2156423206 has 8 divisors (see below), whose sum is σ = 3696725520. Its totient is φ = 924181368.

The previous prime is 2156423177. The next prime is 2156423219. The reversal of 2156423206 is 6023246512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×2156423206² = 9300322086750636872, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77015101 + ... + 77015128.

It is an arithmetic number, because the mean of its divisors is an integer number (462090690).

Almost surely, 2^2156423206 is an apocalyptic number.

2156423206 is a deficient number, since it is larger than the sum of its proper divisors (1540302314).

2156423206 is a wasteful number, since it uses less digits than its factorization.

2156423206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154030238.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 2156423206 is about 46437.3040345798. The cubic root of 2156423206 is about 1291.9469041592.

Adding to 2156423206 its reverse (6023246512), we get a palindrome (8179669718).

The spelling of 2156423206 in words is "two billion, one hundred fifty-six million, four hundred twenty-three thousand, two hundred six".