20164506421 has 8 divisors (see below), whose sum is σ = 20363470400. Its totient is φ = 19965604032.

The previous prime is 20164506347. The next prime is 20164506437. The reversal of 20164506421 is 12460546102.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20164506421 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 (20164506721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 920605 + ... + 942253.

It is an arithmetic number, because the mean of its divisors is an integer number (2545433800).

Almost surely, 2^20164506421 is an apocalyptic number.

It is an amenable number.

20164506421 is a deficient number, since it is larger than the sum of its proper divisors (198963979).

20164506421 is a wasteful number, since it uses less digits than its factorization.

20164506421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30795.

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 20164506421 in words is "twenty billion, one hundred sixty-four million, five hundred six thousand, four hundred twenty-one".