21774983 has 2 divisors, whose sum is σ = 21774984. Its totient is φ = 21774982.

The previous prime is 21774979. The next prime is 21775031. The reversal of 21774983 is 38947712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21774983 - 2² = 21774979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21774983.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21771983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10887491 + 10887492.

It is an arithmetic number, because the mean of its divisors is an integer number (10887492).

Almost surely, 2^21774983 is an apocalyptic number.

21774983 is a deficient number, since it is larger than the sum of its proper divisors (1).

21774983 is an equidigital number, since it uses as much as digits as its factorization.

21774983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 41.

The square root of 21774983 is about 4666.3672165829. The cubic root of 21774983 is about 279.2453445823.

The spelling of 21774983 in words is "twenty-one million, seven hundred seventy-four thousand, nine hundred eighty-three".