21077401 has 2 divisors, whose sum is σ = 21077402. Its totient is φ = 21077400.

The previous prime is 21077393. The next prime is 21077431. The reversal of 21077401 is 10477012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13868176 + 7209225 = 3724^2 + 2685^2 .

It is a cyclic number.

It is not a de Polignac number, because 21077401 - 2³ = 21077393 is a prime.

It is not a weakly prime, because it can be changed into another prime (21077431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10538700 + 10538701.

It is an arithmetic number, because the mean of its divisors is an integer number (10538701).

Almost surely, 2^21077401 is an apocalyptic number.

It is an amenable number.

21077401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21077401 is an equidigital number, since it uses as much as digits as its factorization.

21077401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 21077401 is about 4591.0130690295. The cubic root of 21077401 is about 276.2309599703.

The spelling of 21077401 in words is "twenty-one million, seventy-seven thousand, four hundred one".