21412277 has 2 divisors, whose sum is σ = 21412278. Its totient is φ = 21412276.

The previous prime is 21412273. The next prime is 21412301. The reversal of 21412277 is 77221412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16434916 + 4977361 = 4054^2 + 2231^2 .

It is a cyclic number.

It is not a de Polignac number, because 21412277 - 2² = 21412273 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21412273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10706138 + 10706139.

It is an arithmetic number, because the mean of its divisors is an integer number (10706139).

Almost surely, 2^21412277 is an apocalyptic number.

It is an amenable number.

21412277 is a deficient number, since it is larger than the sum of its proper divisors (1).

21412277 is an equidigital number, since it uses as much as digits as its factorization.

21412277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1568, while the sum is 26.

The square root of 21412277 is about 4627.3401647167. The cubic root of 21412277 is about 277.6861916316.

Adding to 21412277 its reverse (77221412), we get a palindrome (98633689).

The spelling of 21412277 in words is "twenty-one million, four hundred twelve thousand, two hundred seventy-seven".