222221121220021 has 96 divisors (see below), whose sum is σ = 290012086425600. Its totient is φ = 166475748700800.

The previous prime is 222221121220019. The next prime is 222221121220027. The reversal of 222221121220021 is 120022121122222.

It is not a de Polignac number, because 222221121220021 - 2¹ = 222221121220019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222221121219974 and 222221121220001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222221121220027) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 10141978056 + ... + 10141999966.

It is an arithmetic number, because the mean of its divisors is an integer number (3020959233600).

Almost surely, 2^{222221121220021} is an apocalyptic number.

It is an amenable number.

222221121220021 is a deficient number, since it is larger than the sum of its proper divisors (67790965205579).

222221121220021 is a wasteful number, since it uses less digits than its factorization.

222221121220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23711 (or 23700 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 222221121220021 its reverse (120022121122222), we get a palindrome (342243242342243).

The spelling of 222221121220021 in words is "two hundred twenty-two trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred twenty thousand, twenty-one".