21310936 has 8 divisors (see below), whose sum is σ = 39958020. Its totient is φ = 10655464.

The previous prime is 21310921. The next prime is 21310937. The reversal of 21310936 is 63901312.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21310936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1331926 + ... + 1331941.

Almost surely, 2^21310936 is an apocalyptic number.

It is an amenable number.

21310936 is a deficient number, since it is larger than the sum of its proper divisors (18647084).

21310936 is a wasteful number, since it uses less digits than its factorization.

21310936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2663873 (or 2663869 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 21310936 is about 4616.3769343501. The cubic root of 21310936 is about 277.2474167314.

The spelling of 21310936 in words is "twenty-one million, three hundred ten thousand, nine hundred thirty-six".