21472213156 has 27 divisors (see below), whose sum is σ = 38536788577. Its totient is φ = 10468388960.

The previous prime is 21472213117. The next prime is 21472213163. The reversal of 21472213156 is 65131227412.

The square root of 21472213156 is 146534.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1034651556 + 20437561600 = 32166^2 + 142960^2 .

It is a super-2 number, since 2×21472213156² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12014895 + ... + 12016681.

Almost surely, 2^21472213156 is an apocalyptic number.

21472213156 is the 146534-th square number.

It is an amenable number.

21472213156 is a deficient number, since it is larger than the sum of its proper divisors (17064575421).

21472213156 is an frugal number, since it uses more digits than its factorization.

21472213156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3660 (or 1830 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The spelling of 21472213156 in words is "twenty-one billion, four hundred seventy-two million, two hundred thirteen thousand, one hundred fifty-six".