21267401 has 2 divisors, whose sum is σ = 21267402. Its totient is φ = 21267400.

The previous prime is 21267383. The next prime is 21267437. The reversal of 21267401 is 10476212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12996025 + 8271376 = 3605^2 + 2876^2 .

It is a cyclic number.

It is not a de Polignac number, because 21267401 - 2¹⁴ = 21251017 is a prime.

It is not a weakly prime, because it can be changed into another prime (21267451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10633700 + 10633701.

It is an arithmetic number, because the mean of its divisors is an integer number (10633701).

Almost surely, 2^21267401 is an apocalyptic number.

It is an amenable number.

21267401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21267401 is an equidigital number, since it uses as much as digits as its factorization.

21267401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 21267401 is about 4611.6592458680. The cubic root of 21267401 is about 277.0584965973.

The spelling of 21267401 in words is "twenty-one million, two hundred sixty-seven thousand, four hundred one".