20122552421 has 4 divisors (see below), whose sum is σ = 20126520972. Its totient is φ = 20118583872.

The previous prime is 20122552399. The next prime is 20122552447. The reversal of 20122552421 is 12425522102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10792924321 + 9329628100 = 103889^2 + 96590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20122552421 is a prime.

It is a super-2 number, since 2×20122552421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122552481) 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, 1976660 + ... + 1986813.

It is an arithmetic number, because the mean of its divisors is an integer number (5031630243).

Almost surely, 2^20122552421 is an apocalyptic number.

It is an amenable number.

20122552421 is a deficient number, since it is larger than the sum of its proper divisors (3968551).

20122552421 is an equidigital number, since it uses as much as digits as its factorization.

20122552421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3968550.

The product of its (nonzero) digits is 3200, while the sum is 26.

The spelling of 20122552421 in words is "twenty billion, one hundred twenty-two million, five hundred fifty-two thousand, four hundred twenty-one".