21963140 has 24 divisors (see below), whose sum is σ = 46775232. Its totient is φ = 8660960.

The previous prime is 21963127. The next prime is 21963143. The reversal of 21963140 is 4136912.

It is not an unprimeable number, because it can be changed into a prime (21963143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6314 + ... + 9153.

It is an arithmetic number, because the mean of its divisors is an integer number (1948968).

Almost surely, 2^21963140 is an apocalyptic number.

21963140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21963140 is an abundant number, since it is smaller than the sum of its proper divisors (24812092).

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

21963140 is a wasteful number, since it uses less digits than its factorization.

21963140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15547 (or 15545 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 21963140 is about 4686.4848234044. The cubic root of 21963140 is about 280.0473559359.

The spelling of 21963140 in words is "twenty-one million, nine hundred sixty-three thousand, one hundred forty".