20122420021 has 16 divisors (see below), whose sum is σ = 22916903040. Its totient is φ = 17489545920.

The previous prime is 20122419949. The next prime is 20122420033. The reversal of 20122420021 is 12002422102.

It is a de Polignac number, because none of the positive numbers 2^k-20122420021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20122419977 and 20122420004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122420121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 556531 + ... + 591583.

It is an arithmetic number, because the mean of its divisors is an integer number (1432306440).

Almost surely, 2^20122420021 is an apocalyptic number.

It is an amenable number.

20122420021 is a deficient number, since it is larger than the sum of its proper divisors (2794483019).

20122420021 is a wasteful number, since it uses less digits than its factorization.

20122420021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37356.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 20122420021 its reverse (12002422102), we get a palindrome (32124842123).

The spelling of 20122420021 in words is "twenty billion, one hundred twenty-two million, four hundred twenty thousand, twenty-one".