222211122210021 has 32 divisors (see below), whose sum is σ = 346273837062400. Its totient is φ = 126699933120768.

The previous prime is 222211122210019. The next prime is 222211122210037. The reversal of 222211122210021 is 120012221112222.

It is not a de Polignac number, because 222211122210021 - 2¹ = 222211122210019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 222211122210021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222211122210221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 235797376 + ... + 236737881.

It is an arithmetic number, because the mean of its divisors is an integer number (10821057408200).

Almost surely, 2^{222211122210021} is an apocalyptic number.

222211122210021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

222211122210021 is a deficient number, since it is larger than the sum of its proper divisors (124062714852379).

222211122210021 is an equidigital number, since it uses as much as digits as its factorization.

222211122210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472535738 (or 472535724 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 222211122210021 its reverse (120012221112222), we get a palindrome (342223343322243).

The spelling of 222211122210021 in words is "two hundred twenty-two trillion, two hundred eleven billion, one hundred twenty-two million, two hundred ten thousand, twenty-one".