16121891038 has 16 divisors (see below), whose sum is σ = 26443954800. Its totient is φ = 7310721600.

The previous prime is 16121891003. The next prime is 16121891063. The reversal of 16121891038 is 83019812161.

It is a happy number.

It is a super-2 number, since 2×16121891038² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 861063 + ... + 879586.

It is an arithmetic number, because the mean of its divisors is an integer number (1652747175).

Almost surely, 2^16121891038 is an apocalyptic number.

16121891038 is a deficient number, since it is larger than the sum of its proper divisors (10322063762).

16121891038 is a wasteful number, since it uses less digits than its factorization.

16121891038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1741083.

The product of its (nonzero) digits is 20736, while the sum is 40.

The spelling of 16121891038 in words is "sixteen billion, one hundred twenty-one million, eight hundred ninety-one thousand, thirty-eight".