21496877 has 2 divisors, whose sum is σ = 21496878. Its totient is φ = 21496876.

The previous prime is 21496841. The next prime is 21496879. The reversal of 21496877 is 77869412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18826921 + 2669956 = 4339^2 + 1634^2 .

It is a cyclic number.

It is not a de Polignac number, because 21496877 - 2¹⁴ = 21480493 is a prime.

Together with 21496879, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21496879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10748438 + 10748439.

It is an arithmetic number, because the mean of its divisors is an integer number (10748439).

Almost surely, 2^21496877 is an apocalyptic number.

It is an amenable number.

21496877 is a deficient number, since it is larger than the sum of its proper divisors (1).

21496877 is an equidigital number, since it uses as much as digits as its factorization.

21496877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 44.

The square root of 21496877 is about 4636.4724737671. The cubic root of 21496877 is about 278.0514241602.

The spelling of 21496877 in words is "twenty-one million, four hundred ninety-six thousand, eight hundred seventy-seven".