10101221221 has 32 divisors (see below), whose sum is σ = 12532455936. Its totient is φ = 7928064000.

The previous prime is 10101221183. The next prime is 10101221231. The reversal of 10101221221 is 12212210101.

It is a cyclic number.

It is not a de Polignac number, because 10101221221 - 2⁷ = 10101221093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10101221231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6819801 + ... + 6821281.

It is an arithmetic number, because the mean of its divisors is an integer number (391639248).

Almost surely, 2^10101221221 is an apocalyptic number.

It is an amenable number.

10101221221 is a deficient number, since it is larger than the sum of its proper divisors (2431234715).

10101221221 is a wasteful number, since it uses less digits than its factorization.

10101221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2053.

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

Adding to 10101221221 its reverse (12212210101), we get a palindrome (22313431322).

The spelling of 10101221221 in words is "ten billion, one hundred one million, two hundred twenty-one thousand, two hundred twenty-one".