21950787 has 4 divisors (see below), whose sum is σ = 29267720. Its totient is φ = 14633856.

The previous prime is 21950783. The next prime is 21950801. The reversal of 21950787 is 78705912.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21950787 - 2² = 21950783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21950783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3658462 + ... + 3658467.

It is an arithmetic number, because the mean of its divisors is an integer number (7316930).

Almost surely, 2^21950787 is an apocalyptic number.

21950787 is a deficient number, since it is larger than the sum of its proper divisors (7316933).

21950787 is an equidigital number, since it uses as much as digits as its factorization.

21950787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7316932.

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 21950787 is about 4685.1666992755. The cubic root of 21950787 is about 279.9948425921.

The spelling of 21950787 in words is "twenty-one million, nine hundred fifty thousand, seven hundred eighty-seven".