22002042421 has 4 divisors (see below), whose sum is σ = 22538677644. Its totient is φ = 21465407200.

The previous prime is 22002042409. The next prime is 22002042463. The reversal of 22002042421 is 12424020022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12424020022 = 2 ⋅6212010011.

It can be written as a sum of positive squares in 2 ways, for example, as 13291553521 + 8710488900 = 115289^2 + 93330^2 .

It is a cyclic number.

It is not a de Polignac number, because 22002042421 - 2²¹ = 21999945269 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 (22002042721) 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, 268317550 + ... + 268317631.

It is an arithmetic number, because the mean of its divisors is an integer number (5634669411).

Almost surely, 2^22002042421 is an apocalyptic number.

It is an amenable number.

22002042421 is a deficient number, since it is larger than the sum of its proper divisors (536635223).

22002042421 is an equidigital number, since it uses as much as digits as its factorization.

22002042421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536635222.

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 22002042421 its reverse (12424020022), we get a palindrome (34426062443).

The spelling of 22002042421 in words is "twenty-two billion, two million, forty-two thousand, four hundred twenty-one".