21295001 has 16 divisors (see below), whose sum is σ = 26345088. Its totient is φ = 16761600.

The previous prime is 21294989. The next prime is 21295013. The reversal of 21295001 is 10059212.

21295001 = 169² + 170² + ... + 409².

It is an interprime number because it is at equal distance from previous prime (21294989) and next prime (21295013).

It is a cyclic number.

It is not a de Polignac number, because 21295001 - 2⁶ = 21294937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21295051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21446 + ... + 22416.

It is an arithmetic number, because the mean of its divisors is an integer number (1646568).

Almost surely, 2^21295001 is an apocalyptic number.

It is an amenable number.

21295001 is a deficient number, since it is larger than the sum of its proper divisors (5050087).

21295001 is a wasteful number, since it uses less digits than its factorization.

21295001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 21295001 is about 4614.6506910058. The cubic root of 21295001 is about 277.1782966766.

The spelling of 21295001 in words is "twenty-one million, two hundred ninety-five thousand, one".