21055030 has 8 divisors (see below), whose sum is σ = 37899072. Its totient is φ = 8422008.

The previous prime is 21055003. The next prime is 21055033. The reversal of 21055030 is 3055012.

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

It is a junction number, because it is equal to n+sod(n) for n = 21054995 and 21055013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21055033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1052742 + ... + 1052761.

It is an arithmetic number, because the mean of its divisors is an integer number (4737384).

Almost surely, 2^21055030 is an apocalyptic number.

21055030 is a deficient number, since it is larger than the sum of its proper divisors (16844042).

21055030 is a wasteful number, since it uses less digits than its factorization.

21055030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2105510.

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 21055030 is about 4588.5760318426. The cubic root of 21055030 is about 276.1331972785.

The spelling of 21055030 in words is "twenty-one million, fifty-five thousand, thirty".