21430752001 has 4 divisors (see below), whose sum is σ = 21471886404. Its totient is φ = 21389617600.

The previous prime is 21430751999. The next prime is 21430752017. The reversal of 21430752001 is 10025703412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4315833025 + 17114918976 = 65695^2 + 130824^2 .

It is a cyclic number.

It is not a de Polignac number, because 21430752001 - 2¹ = 21430751999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21430752701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20566420 + ... + 20567461.

It is an arithmetic number, because the mean of its divisors is an integer number (5367971601).

Almost surely, 2^21430752001 is an apocalyptic number.

It is an amenable number.

21430752001 is a deficient number, since it is larger than the sum of its proper divisors (41134403).

21430752001 is an equidigital number, since it uses as much as digits as its factorization.

21430752001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41134402.

The product of its (nonzero) digits is 1680, while the sum is 25.

The spelling of 21430752001 in words is "twenty-one billion, four hundred thirty million, seven hundred fifty-two thousand, one".