221012212111002 has 24 divisors (see below), whose sum is σ = 515695161592884. Its totient is φ = 68003757572544.

The previous prime is 221012212110961. The next prime is 221012212111003. The reversal of 221012212111002 is 200111212210122.

221012212111002 is a `hidden beast` number, since 221 + 0 + 1 + 221 + 211 + 10 + 0 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 194616980369361 + 26395231741641 = 13950519^2 + 5137629^2 .

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

It is not an unprimeable number, because it can be changed into a prime (221012212111003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 472248316243 + ... + 472248316710.

Almost surely, 2^{221012212111002} is an apocalyptic number.

221012212111002 is an abundant number, since it is smaller than the sum of its proper divisors (294682949481882).

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

221012212111002 is a wasteful number, since it uses less digits than its factorization.

221012212111002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944496632974 (or 944496632971 counting only the distinct ones).

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

Adding to 221012212111002 its reverse (200111212210122), we get a palindrome (421123424321124).

The spelling of 221012212111002 in words is "two hundred twenty-one trillion, twelve billion, two hundred twelve million, one hundred eleven thousand, two".