21314940 has 48 divisors (see below), whose sum is σ = 63195552. Its totient is φ = 5349376.

The previous prime is 21314933. The next prime is 21314947. The reversal of 21314940 is 4941312.

It is an interprime number because it is at equal distance from previous prime (21314933) and next prime (21314947).

It is a self number, because there is not a number n which added to its sum of digits gives 21314940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21314947) 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, 9429 + ... + 11468.

It is an arithmetic number, because the mean of its divisors is an integer number (1316574).

Almost surely, 2^21314940 is an apocalyptic number.

21314940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21314940 is an abundant number, since it is smaller than the sum of its proper divisors (41880612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21314940 is a wasteful number, since it uses less digits than its factorization.

21314940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20926 (or 20924 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21314940 is about 4616.8105874077. The cubic root of 21314940 is about 277.2647791651.

The spelling of 21314940 in words is "twenty-one million, three hundred fourteen thousand, nine hundred forty".