10102121221 has 4 divisors (see below), whose sum is σ = 10154464012. Its totient is φ = 10049778432.

The previous prime is 10102121173. The next prime is 10102121269. The reversal of 10102121221 is 12212120101.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (10102121173) and next prime (10102121269).

It can be written as a sum of positive squares in 2 ways, for example, as 1057160196 + 9044961025 = 32514^2 + 95105^2 .

It is a cyclic number.

It is not a de Polignac number, because 10102121221 - 2¹³ = 10102113029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10102121321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26171106 + ... + 26171491.

It is an arithmetic number, because the mean of its divisors is an integer number (2538616003).

Almost surely, 2^10102121221 is an apocalyptic number.

It is an amenable number.

10102121221 is a deficient number, since it is larger than the sum of its proper divisors (52342791).

10102121221 is an equidigital number, since it uses as much as digits as its factorization.

10102121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52342790.

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

Adding to 10102121221 its reverse (12212120101), we get a palindrome (22314241322).

The spelling of 10102121221 in words is "ten billion, one hundred two million, one hundred twenty-one thousand, two hundred twenty-one".