221211012212010 has 96 divisors (see below), whose sum is σ = 594455567773392. Its totient is φ = 57029714426880.

The previous prime is 221211012211927. The next prime is 221211012212027. The reversal of 221211012212010 is 10212210112122.

221211012212010 is a `hidden beast` number, since 22 + 121 + 101 + 221 + 201 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 163617074281521 + 57593937930489 = 12791289^2 + 7589067^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 211036851 + ... + 212082470.

Almost surely, 2^{221211012212010} is an apocalyptic number.

221211012212010 is an abundant number, since it is smaller than the sum of its proper divisors (373244555561382).

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

221211012212010 is a wasteful number, since it uses less digits than its factorization.

221211012212010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423119528 (or 423119525 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 221211012212010 its reverse (10212210112122), we get a palindrome (231423222324132).

The spelling of 221211012212010 in words is "two hundred twenty-one trillion, two hundred eleven billion, twelve million, two hundred twelve thousand, ten".