21024890066 has 8 divisors (see below), whose sum is σ = 31546272204. Its totient is φ = 10509466000.

The previous prime is 21024890057. The next prime is 21024890083. The reversal of 21024890066 is 66009842012.

It can be written as a sum of positive squares in 2 ways, for example, as 20973122041 + 51768025 = 144821^2 + 7195^2 .

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

It is a Curzon 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, 1480685 + ... + 1494816.

Almost surely, 2^21024890066 is an apocalyptic number.

21024890066 is a deficient number, since it is larger than the sum of its proper divisors (10521382138).

21024890066 is a wasteful number, since it uses less digits than its factorization.

21024890066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2979036.

The product of its (nonzero) digits is 41472, while the sum is 38.

The spelling of 21024890066 in words is "twenty-one billion, twenty-four million, eight hundred ninety thousand, sixty-six".