21021020210198 has 8 divisors (see below), whose sum is σ = 31555399759320. Its totient is φ = 10502553623760.

The previous prime is 21021020210159. The next prime is 21021020210219. The reversal of 21021020210198 is 89101202012012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21021020210198.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3978237368 + ... + 3978242651.

It is an arithmetic number, because the mean of its divisors is an integer number (3944424969915).

Almost surely, 2^{21021020210198} is an apocalyptic number.

21021020210198 is a deficient number, since it is larger than the sum of its proper divisors (10534379549122).

21021020210198 is a wasteful number, since it uses less digits than its factorization.

21021020210198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7956481342.

The product of its (nonzero) digits is 1152, while the sum is 29.

The spelling of 21021020210198 in words is "twenty-one trillion, twenty-one billion, twenty million, two hundred ten thousand, one hundred ninety-eight".