21983720162 has 8 divisors (see below), whose sum is σ = 33119579100. Its totient is φ = 10943860464.

The previous prime is 21983720159. The next prime is 21983720173. The reversal of 21983720162 is 26102738912.

It can be written as a sum of positive squares in 2 ways, for example, as 21913176961 + 70543201 = 148031^2 + 8399^2 .

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

It is a super-2 number, since 2×21983720162² (a number of 21 digits) contains 22 as substring.

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, 23999237 + ... + 24000152.

Almost surely, 2^21983720162 is an apocalyptic number.

21983720162 is a deficient number, since it is larger than the sum of its proper divisors (11135858938).

21983720162 is a wasteful number, since it uses less digits than its factorization.

21983720162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47999620.

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 21983720162 in words is "twenty-one billion, nine hundred eighty-three million, seven hundred twenty thousand, one hundred sixty-two".