21003094 has 32 divisors (see below), whose sum is σ = 39559680. Its totient is φ = 8154432.

The previous prime is 21003083. The next prime is 21003097. The reversal of 21003094 is 49030012.

It is a super-2 number, since 2×21003094² = 882259915145672, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003097) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4402 + ... + 7834.

It is an arithmetic number, because the mean of its divisors is an integer number (1236240).

Almost surely, 2^21003094 is an apocalyptic number.

21003094 is a deficient number, since it is larger than the sum of its proper divisors (18556586).

21003094 is a wasteful number, since it uses less digits than its factorization.

21003094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3484.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 21003094 is about 4582.9132655986. The cubic root of 21003094 is about 275.9059663559.

The spelling of 21003094 in words is "twenty-one million, three thousand, ninety-four".