21775063 has 2 divisors, whose sum is σ = 21775064. Its totient is φ = 21775062.

The previous prime is 21775057. The next prime is 21775069. The reversal of 21775063 is 36057712.

It is a balanced prime because it is at equal distance from previous prime (21775057) and next prime (21775069).

It is a cyclic number.

It is not a de Polignac number, because 21775063 - 2⁵ = 21775031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21775069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10887531 + 10887532.

It is an arithmetic number, because the mean of its divisors is an integer number (10887532).

Almost surely, 2^21775063 is an apocalyptic number.

21775063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21775063 is an equidigital number, since it uses as much as digits as its factorization.

21775063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 21775063 is about 4666.3757885537. The cubic root of 21775063 is about 279.2456865588.

The spelling of 21775063 in words is "twenty-one million, seven hundred seventy-five thousand, sixty-three".