10121121998 has 64 divisors (see below), whose sum is σ = 16944463872. Its totient is φ = 4505155200.

The previous prime is 10121121991. The next prime is 10121122001. The reversal of 10121121998 is 89912112101.

It is a happy number.

It is a super-2 number, since 2×10121121998² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121121991) 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, 26425715 + ... + 26426097.

It is an arithmetic number, because the mean of its divisors is an integer number (264757248).

Almost surely, 2^10121121998 is an apocalyptic number.

10121121998 is a deficient number, since it is larger than the sum of its proper divisors (6823341874).

10121121998 is a wasteful number, since it uses less digits than its factorization.

10121121998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729.

The product of its (nonzero) digits is 2592, while the sum is 35.

The spelling of 10121121998 in words is "ten billion, one hundred twenty-one million, one hundred twenty-one thousand, nine hundred ninety-eight".