222424020421 has 4 divisors (see below), whose sum is σ = 222426109312. Its totient is φ = 222421931532.

The previous prime is 222424020389. The next prime is 222424020457. The reversal of 222424020421 is 124020424222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 124020424222 = 2 ⋅62010212111.

It is a cyclic number.

It is not a de Polignac number, because 222424020421 - 2⁵ = 222424020389 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 (222427020421) 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, 875631 + ... + 1100716.

It is an arithmetic number, because the mean of its divisors is an integer number (55606527328).

Almost surely, 2^222424020421 is an apocalyptic number.

It is an amenable number.

222424020421 is a deficient number, since it is larger than the sum of its proper divisors (2088891).

222424020421 is a wasteful number, since it uses less digits than its factorization.

222424020421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2088890.

The product of its (nonzero) digits is 4096, while the sum is 25.

Adding to 222424020421 its reverse (124020424222), we get a palindrome (346444444643).

The spelling of 222424020421 in words is "two hundred twenty-two billion, four hundred twenty-four million, twenty thousand, four hundred twenty-one".