21462993 has 12 divisors (see below), whose sum is σ = 32825988. Its totient is φ = 13466880.

The previous prime is 21462983. The next prime is 21463009. The reversal of 21462993 is 39926412.

21462993 is a `hidden beast` number, since 21 + 4 + 629 + 9 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17040384 + 4422609 = 4128^2 + 2103^2 .

It is not a de Polignac number, because 21462993 - 2¹⁰ = 21461969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21462983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69988 + ... + 70293.

It is an arithmetic number, because the mean of its divisors is an integer number (2735499).

Almost surely, 2^21462993 is an apocalyptic number.

It is an amenable number.

21462993 is a deficient number, since it is larger than the sum of its proper divisors (11362995).

21462993 is a wasteful number, since it uses less digits than its factorization.

21462993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140304 (or 140301 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 21462993 is about 4632.8169616336. The cubic root of 21462993 is about 277.9052564333.

The spelling of 21462993 in words is "twenty-one million, four hundred sixty-two thousand, nine hundred ninety-three".