21076477 has 2 divisors, whose sum is σ = 21076478. Its totient is φ = 21076476.

The previous prime is 21076463. The next prime is 21076499. The reversal of 21076477 is 77467012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20738916 + 337561 = 4554^2 + 581^2 .

It is a cyclic number.

It is not a de Polignac number, because 21076477 - 2²³ = 12687869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21076427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10538238 + 10538239.

It is an arithmetic number, because the mean of its divisors is an integer number (10538239).

Almost surely, 2^21076477 is an apocalyptic number.

It is an amenable number.

21076477 is a deficient number, since it is larger than the sum of its proper divisors (1).

21076477 is an equidigital number, since it uses as much as digits as its factorization.

21076477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16464, while the sum is 34.

The square root of 21076477 is about 4590.9124365424. The cubic root of 21076477 is about 276.2269234015.

The spelling of 21076477 in words is "twenty-one million, seventy-six thousand, four hundred seventy-seven".