10121221999 has 12 divisors (see below), whose sum is σ = 11780146224. Its totient is φ = 8670558624.

The previous prime is 10121221997. The next prime is 10121222011. The reversal of 10121221999 is 99912212101.

It is not a de Polignac number, because 10121221999 - 2¹ = 10121221997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121221997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34587 + ... + 146419.

It is an arithmetic number, because the mean of its divisors is an integer number (981678852).

Almost surely, 2^10121221999 is an apocalyptic number.

10121221999 is a deficient number, since it is larger than the sum of its proper divisors (1658924225).

10121221999 is a wasteful number, since it uses less digits than its factorization.

10121221999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113694 (or 113687 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 37.

The spelling of 10121221999 in words is "ten billion, one hundred twenty-one million, two hundred twenty-one thousand, nine hundred ninety-nine".