100121311221 has 8 divisors (see below), whose sum is σ = 133500136224. Its totient is φ = 66745013520.

The previous prime is 100121311207. The next prime is 100121311253. The reversal of 100121311221 is 122113121001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 100121311221 - 2⁷ = 100121311093 is a prime.

It is a super-2 number, since 2×100121311221² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 100121311221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100121311291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 537370 + ... + 699291.

It is an arithmetic number, because the mean of its divisors is an integer number (16687517028).

Almost surely, 2^100121311221 is an apocalyptic number.

It is an amenable number.

100121311221 is a deficient number, since it is larger than the sum of its proper divisors (33378825003).

100121311221 is a wasteful number, since it uses less digits than its factorization.

100121311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263651.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 100121311221 its reverse (122113121001), we get a palindrome (222234432222).

The spelling of 100121311221 in words is "one hundred billion, one hundred twenty-one million, three hundred eleven thousand, two hundred twenty-one".