21264601 has 2 divisors, whose sum is σ = 21264602. Its totient is φ = 21264600.

The previous prime is 21264587. The next prime is 21264613. The reversal of 21264601 is 10646212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16646400 + 4618201 = 4080^2 + 2149^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21264601 is a prime.

It is a super-3 number, since 3×21264601³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21264101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10632300 + 10632301.

It is an arithmetic number, because the mean of its divisors is an integer number (10632301).

Almost surely, 2^21264601 is an apocalyptic number.

It is an amenable number.

21264601 is a deficient number, since it is larger than the sum of its proper divisors (1).

21264601 is an equidigital number, since it uses as much as digits as its factorization.

21264601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21264601 is about 4611.3556575046. The cubic root of 21264601 is about 277.0463371764.

The spelling of 21264601 in words is "twenty-one million, two hundred sixty-four thousand, six hundred one".