21055198 has 8 divisors (see below), whose sum is σ = 31626792. Its totient is φ = 10512936.

The previous prime is 21055147. The next prime is 21055207. The reversal of 21055198 is 89155012.

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

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, 5440 + ... + 8467.

It is an arithmetic number, because the mean of its divisors is an integer number (3953349).

Almost surely, 2^21055198 is an apocalyptic number.

21055198 is a deficient number, since it is larger than the sum of its proper divisors (10571594).

21055198 is a wasteful number, since it uses less digits than its factorization.

21055198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14666.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 21055198 is about 4588.5943381389. The cubic root of 21055198 is about 276.1339317072.

The spelling of 21055198 in words is "twenty-one million, fifty-five thousand, one hundred ninety-eight".