22120402421 has 16 divisors (see below), whose sum is σ = 24867623424. Its totient is φ = 19523268864.

The previous prime is 22120402417. The next prime is 22120402429. The reversal of 22120402421 is 12420402122.

It is a cyclic number.

It is not a de Polignac number, because 22120402421 - 2² = 22120402417 is a prime.

It is a super-2 number, since 2×22120402421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22120402393 and 22120402402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22120402429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 813965 + ... + 840701.

It is an arithmetic number, because the mean of its divisors is an integer number (1554226464).

Almost surely, 2^22120402421 is an apocalyptic number.

It is an amenable number.

22120402421 is a deficient number, since it is larger than the sum of its proper divisors (2747221003).

22120402421 is a wasteful number, since it uses less digits than its factorization.

22120402421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29540.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 22120402421 its reverse (12420402122), we get a palindrome (34540804543).

The spelling of 22120402421 in words is "twenty-two billion, one hundred twenty million, four hundred two thousand, four hundred twenty-one".