21126691498 has 32 divisors (see below), whose sum is σ = 34872900480. Its totient is φ = 9519456960.

The previous prime is 21126691493. The next prime is 21126691507. The reversal of 21126691498 is 89419662112.

It is not an unprimeable number, because it can be changed into a prime (21126691493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1509340 + ... + 1523272.

It is an arithmetic number, because the mean of its divisors is an integer number (1089778140).

Almost surely, 2^21126691498 is an apocalyptic number.

21126691498 is a deficient number, since it is larger than the sum of its proper divisors (13746208982).

21126691498 is a wasteful number, since it uses less digits than its factorization.

21126691498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14542.

The product of its digits is 373248, while the sum is 49.

The spelling of 21126691498 in words is "twenty-one billion, one hundred twenty-six million, six hundred ninety-one thousand, four hundred ninety-eight".