20106564421 has 8 divisors (see below), whose sum is σ = 20536360704. Its totient is φ = 19676851440.

The previous prime is 20106564409. The next prime is 20106564433. The reversal of 20106564421 is 12446560102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20106564409) and next prime (20106564433).

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

It is a cyclic number.

It is not a de Polignac number, because 20106564421 - 2⁷ = 20106564293 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 (20106564481) 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, 861891 + ... + 884911.

It is an arithmetic number, because the mean of its divisors is an integer number (2567045088).

Almost surely, 2^20106564421 is an apocalyptic number.

It is an amenable number.

20106564421 is a deficient number, since it is larger than the sum of its proper divisors (429796283).

20106564421 is a wasteful number, since it uses less digits than its factorization.

20106564421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41651.

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

The spelling of 20106564421 in words is "twenty billion, one hundred six million, five hundred sixty-four thousand, four hundred twenty-one".