21622145644724 has 6 divisors (see below), whose sum is σ = 37838754878274. Its totient is φ = 10811072822360.

The previous prime is 21622145644711. The next prime is 21622145644763. The reversal of 21622145644724 is 42744654122612.

It can be written as a sum of positive squares in only one way, i.e., 18197203209124 + 3424942435600 = 4265818^2 + 1850660^2 .

It is a congruent 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 as a sum of consecutive naturals, namely, 2702768205587 + ... + 2702768205594.

It is an arithmetic number, because the mean of its divisors is an integer number (6306459146379).

Almost surely, 2^{21622145644724} is an apocalyptic number.

It is an amenable number.

21622145644724 is a deficient number, since it is larger than the sum of its proper divisors (16216609233550).

21622145644724 is a wasteful number, since it uses less digits than its factorization.

21622145644724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5405536411185 (or 5405536411183 counting only the distinct ones).

The product of its digits is 5160960, while the sum is 50.

The spelling of 21622145644724 in words is "twenty-one trillion, six hundred twenty-two billion, one hundred forty-five million, six hundred forty-four thousand, seven hundred twenty-four".