21930903 has 24 divisors (see below), whose sum is σ = 32981520. Its totient is φ = 14031360.

The previous prime is 21930893. The next prime is 21930913. The reversal of 21930903 is 30903912.

It is an interprime number because it is at equal distance from previous prime (21930893) and next prime (21930913).

It is not a de Polignac number, because 21930903 - 2⁸ = 21930647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21930913) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23143 + ... + 24071.

It is an arithmetic number, because the mean of its divisors is an integer number (1374230).

Almost surely, 2^21930903 is an apocalyptic number.

21930903 is a deficient number, since it is larger than the sum of its proper divisors (11050617).

21930903 is a wasteful number, since it uses less digits than its factorization.

21930903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039 (or 1036 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 21930903 is about 4683.0442022257. The cubic root of 21930903 is about 279.9102731206.

The spelling of 21930903 in words is "twenty-one million, nine hundred thirty thousand, nine hundred three".