21140599 has 2 divisors, whose sum is σ = 21140600. Its totient is φ = 21140598.

The previous prime is 21140569. The next prime is 21140621. The reversal of 21140599 is 99504112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21140599 - 2²¹ = 19043447 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21140599.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21140549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570299 + 10570300.

It is an arithmetic number, because the mean of its divisors is an integer number (10570300).

Almost surely, 2^21140599 is an apocalyptic number.

21140599 is a deficient number, since it is larger than the sum of its proper divisors (1).

21140599 is an equidigital number, since it uses as much as digits as its factorization.

21140599 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 21140599 is about 4597.8907120548. The cubic root of 21140599 is about 276.5067660404.

The spelling of 21140599 in words is "twenty-one million, one hundred forty thousand, five hundred ninety-nine".