100012001021221 has 16 divisors (see below), whose sum is σ = 100391333548288. Its totient is φ = 99633296505600.

The previous prime is 100012001021161. The next prime is 100012001021263. The reversal of 100012001021221 is 122120100210001.

It is a cyclic number.

It is not a de Polignac number, because 100012001021221 - 2⁹ = 100012001020709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100012001027221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1664312386 + ... + 1664372476.

It is an arithmetic number, because the mean of its divisors is an integer number (6274458346768).

Almost surely, 2^{100012001021221} is an apocalyptic number.

It is an amenable number.

100012001021221 is a deficient number, since it is larger than the sum of its proper divisors (379332527067).

100012001021221 is a wasteful number, since it uses less digits than its factorization.

100012001021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65212.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 100012001021221 its reverse (122120100210001), we get a palindrome (222132101231222).

The spelling of 100012001021221 in words is "one hundred trillion, twelve billion, one million, twenty-one thousand, two hundred twenty-one".