101211222101221 has 16 divisors (see below), whose sum is σ = 103248501842304. Its totient is φ = 99191954640384.

The previous prime is 101211222101159. The next prime is 101211222101251. The reversal of 101211222101221 is 122101222112101.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 101211222101221 - 2²⁹ = 101210685230309 is a prime.

It is a super-2 number, since 2×101211222101221² (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 (101211222101251) 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, 33071850 + ... + 36002356.

It is an arithmetic number, because the mean of its divisors is an integer number (6453031365144).

Almost surely, 2^{101211222101221} is an apocalyptic number.

It is an amenable number.

101211222101221 is a deficient number, since it is larger than the sum of its proper divisors (2037279741083).

101211222101221 is a wasteful number, since it uses less digits than its factorization.

101211222101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2933580.

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

Adding to 101211222101221 its reverse (122101222112101), we get a palindrome (223312444213322).

The spelling of 101211222101221 in words is "one hundred one trillion, two hundred eleven billion, two hundred twenty-two million, one hundred one thousand, two hundred twenty-one".