21369177124 has 9 divisors (see below), whose sum is σ = 37396571611. Its totient is φ = 10684442380.

The previous prime is 21369177107. The next prime is 21369177161. The reversal of 21369177124 is 42177196312.

The square root of 21369177124 is 146182.

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

It is a super-2 number, since 2×21369177124² (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 (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 255819 + ... + 328909.

Almost surely, 2^21369177124 is an apocalyptic number.

21369177124 is the 146182-nd square number.

It is an amenable number.

21369177124 is a deficient number, since it is larger than the sum of its proper divisors (16027394487).

21369177124 is an frugal number, since it uses more digits than its factorization.

21369177124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146186 (or 73093 counting only the distinct ones).

The product of its digits is 127008, while the sum is 43.

The spelling of 21369177124 in words is "twenty-one billion, three hundred sixty-nine million, one hundred seventy-seven thousand, one hundred twenty-four".