20664006262021 has 4 divisors (see below), whose sum is σ = 20675050628544. Its totient is φ = 20652961895500.

The previous prime is 20664006262019. The next prime is 20664006262153. The reversal of 20664006262021 is 12026260046602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20664006262021 - 2¹ = 20664006262019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20664006262321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5522180455 + ... + 5522184196.

It is an arithmetic number, because the mean of its divisors is an integer number (5168762657136).

Almost surely, 2^{20664006262021} is an apocalyptic number.

It is an amenable number.

20664006262021 is a deficient number, since it is larger than the sum of its proper divisors (11044366523).

20664006262021 is a wasteful number, since it uses less digits than its factorization.

20664006262021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11044366522.

The product of its (nonzero) digits is 82944, while the sum is 37.

The spelling of 20664006262021 in words is "twenty trillion, six hundred sixty-four billion, six million, two hundred sixty-two thousand, twenty-one".