21123310198 has 16 divisors (see below), whose sum is σ = 32037280704. Its totient is φ = 10444563720.

The previous prime is 21123310183. The next prime is 21123310199. The reversal of 21123310198 is 89101332112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123310199) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35761 + ... + 208627.

It is an arithmetic number, because the mean of its divisors is an integer number (2002330044).

Almost surely, 2^21123310198 is an apocalyptic number.

21123310198 is a deficient number, since it is larger than the sum of its proper divisors (10913970506).

21123310198 is a wasteful number, since it uses less digits than its factorization.

21123310198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173547.

The product of its (nonzero) digits is 2592, while the sum is 31.

The spelling of 21123310198 in words is "twenty-one billion, one hundred twenty-three million, three hundred ten thousand, one hundred ninety-eight".