21311294 has 12 divisors (see below), whose sum is σ = 33418896. Its totient is φ = 10191852.

The previous prime is 21311261. The next prime is 21311347. The reversal of 21311294 is 49211312.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9014 + ... + 11129.

It is an arithmetic number, because the mean of its divisors is an integer number (2784908).

Almost surely, 2^21311294 is an apocalyptic number.

21311294 is a deficient number, since it is larger than the sum of its proper divisors (12107602).

21311294 is a wasteful number, since it uses less digits than its factorization.

21311294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20191 (or 20168 counting only the distinct ones).

The product of its digits is 432, while the sum is 23.

The square root of 21311294 is about 4616.4157091839. The cubic root of 21311294 is about 277.2489692054.

The spelling of 21311294 in words is "twenty-one million, three hundred eleven thousand, two hundred ninety-four".