10121101221 has 32 divisors (see below), whose sum is σ = 17215976448. Its totient is φ = 5135437440.

The previous prime is 10121101219. The next prime is 10121101229. The reversal of 10121101221 is 12210112101.

It is not a de Polignac number, because 10121101221 - 2¹ = 10121101219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10121101197 and 10121101206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121101229) 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, 499536 + ... + 519401.

It is an arithmetic number, because the mean of its divisors is an integer number (537999264).

Almost surely, 2^10121101221 is an apocalyptic number.

10121101221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10121101221 is a deficient number, since it is larger than the sum of its proper divisors (7094875227).

10121101221 is a wasteful number, since it uses less digits than its factorization.

10121101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019001.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 10121101221 its reverse (12210112101), we get a palindrome (22331213322).

The spelling of 10121101221 in words is "ten billion, one hundred twenty-one million, one hundred one thousand, two hundred twenty-one".