21625198198 has 16 divisors (see below), whose sum is σ = 33196363200. Its totient is φ = 10559807496.

The previous prime is 21625198163. The next prime is 21625198223. The reversal of 21625198198 is 89189152612.

It is a happy number.

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, 1255561 + ... + 1272667.

It is an arithmetic number, because the mean of its divisors is an integer number (2074772700).

Almost surely, 2^21625198198 is an apocalyptic number.

21625198198 is a deficient number, since it is larger than the sum of its proper divisors (11571165002).

21625198198 is a wasteful number, since it uses less digits than its factorization.

21625198198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31851.

The product of its digits is 622080, while the sum is 52.

The spelling of 21625198198 in words is "twenty-one billion, six hundred twenty-five million, one hundred ninety-eight thousand, one hundred ninety-eight".