221010210211220 has 24 divisors (see below), whose sum is σ = 491422702705704. Its totient is φ = 83203843844096.

The previous prime is 221010210211171. The next prime is 221010210211331. The reversal of 221010210211220 is 22112012010122.

It can be written as a sum of positive squares in 4 ways, for example, as 15660049169284 + 205350161041936 = 3957278^2 + 14330044^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 325015014677 + ... + 325015015356.

It is an arithmetic number, because the mean of its divisors is an integer number (20475945946071).

Almost surely, 2^{221010210211220} is an apocalyptic number.

221010210211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221010210211220 is an abundant number, since it is smaller than the sum of its proper divisors (270412492494484).

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

221010210211220 is a wasteful number, since it uses less digits than its factorization.

221010210211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650030030059 (or 650030030057 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221010210211220 its reverse (22112012010122), we get a palindrome (243122222221342).

The spelling of 221010210211220 in words is "two hundred twenty-one trillion, ten billion, two hundred ten million, two hundred eleven thousand, two hundred twenty".