21414973 has 2 divisors, whose sum is σ = 21414974. Its totient is φ = 21414972.

The previous prime is 21414961. The next prime is 21414983. The reversal of 21414973 is 37941412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19909444 + 1505529 = 4462^2 + 1227^2 .

It is a cyclic number.

It is not a de Polignac number, because 21414973 - 2⁵ = 21414941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21414923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10707486 + 10707487.

It is an arithmetic number, because the mean of its divisors is an integer number (10707487).

Almost surely, 2^21414973 is an apocalyptic number.

It is an amenable number.

21414973 is a deficient number, since it is larger than the sum of its proper divisors (1).

21414973 is an equidigital number, since it uses as much as digits as its factorization.

21414973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 31.

The square root of 21414973 is about 4627.6314676085. The cubic root of 21414973 is about 277.6978455464.

The spelling of 21414973 in words is "twenty-one million, four hundred fourteen thousand, nine hundred seventy-three".