121101210212221 has 16 divisors (see below), whose sum is σ = 126570190262400. Its totient is φ = 115649326698048.

The previous prime is 121101210212179. The next prime is 121101210212231. The reversal of 121101210212221 is 122212012101121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121101210212221 - 2¹⁹ = 121101209687933 is a prime.

It is a super-2 number, since 2×121101210212221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121101210212231) 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, 42826375 + ... + 45566443.

It is an arithmetic number, because the mean of its divisors is an integer number (7910636891400).

Almost surely, 2^{121101210212221} is an apocalyptic number.

It is an amenable number.

121101210212221 is a deficient number, since it is larger than the sum of its proper divisors (5468980050179).

121101210212221 is a wasteful number, since it uses less digits than its factorization.

121101210212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2743188.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121101210212221 its reverse (122212012101121), we get a palindrome (243313222313342).

The spelling of 121101210212221 in words is "one hundred twenty-one trillion, one hundred one billion, two hundred ten million, two hundred twelve thousand, two hundred twenty-one".