100010121221 has 2 divisors, whose sum is σ = 100010121222. Its totient is φ = 100010121220.

The previous prime is 100010121161. The next prime is 100010121271. The reversal of 100010121221 is 122121010001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95860828996 + 4149292225 = 309614^2 + 64415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100010121221 is a prime.

It is a super-2 number, since 2×100010121221² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100010121271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50005060610 + 50005060611.

It is an arithmetic number, because the mean of its divisors is an integer number (50005060611).

Almost surely, 2^100010121221 is an apocalyptic number.

It is an amenable number.

100010121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

100010121221 is an equidigital number, since it uses as much as digits as its factorization.

100010121221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 100010121221 its reverse (122121010001), we get a palindrome (222131131222).

The spelling of 100010121221 in words is "one hundred billion, ten million, one hundred twenty-one thousand, two hundred twenty-one".