222121220202210 has 64 divisors (see below), whose sum is σ = 609248895494400. Its totient is φ = 50770387944192.

The previous prime is 222121220202181. The next prime is 222121220202227. The reversal of 222121220202210 is 12202022121222.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64296436 + ... + 67662944.

It is an arithmetic number, because the mean of its divisors is an integer number (9519513992100).

Almost surely, 2^{222121220202210} is an apocalyptic number.

222121220202210 is an abundant number, since it is smaller than the sum of its proper divisors (387127675292190).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

222121220202210 is a wasteful number, since it uses less digits than its factorization.

222121220202210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3680715.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 222121220202210 its reverse (12202022121222), we get a palindrome (234323242323432).

The spelling of 222121220202210 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, two hundred twenty million, two hundred two thousand, two hundred ten".