221011210101210 has 64 divisors (see below), whose sum is σ = 544829793080832. Its totient is φ = 57357198017856.

The previous prime is 221011210101133. The next prime is 221011210101229. The reversal of 221011210101210 is 12101012110122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221011210101210.

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, 662217664 + ... + 662551323.

It is an arithmetic number, because the mean of its divisors is an integer number (8512965516888).

Almost surely, 2^{221011210101210} is an apocalyptic number.

221011210101210 is an abundant number, since it is smaller than the sum of its proper divisors (323818582979622).

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

221011210101210 is a wasteful number, since it uses less digits than its factorization.

221011210101210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324769147.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221011210101210 its reverse (12101012110122), we get a palindrome (233112222211332).

The spelling of 221011210101210 in words is "two hundred twenty-one trillion, eleven billion, two hundred ten million, one hundred one thousand, two hundred ten".