21432402001 has 4 divisors (see below), whose sum is σ = 21434301504. Its totient is φ = 21430502500.

The previous prime is 21432401989. The next prime is 21432402011. The reversal of 21432402001 is 10020423412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21432402001 - 2²⁹ = 20895531089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21432402001.

It is not an unprimeable number, because it can be changed into a prime (21432402011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 932725 + ... + 955426.

It is an arithmetic number, because the mean of its divisors is an integer number (5358575376).

Almost surely, 2^21432402001 is an apocalyptic number.

It is an amenable number.

21432402001 is a deficient number, since it is larger than the sum of its proper divisors (1899503).

21432402001 is a wasteful number, since it uses less digits than its factorization.

21432402001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1899502.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21432402001 its reverse (10020423412), we get a palindrome (31452825413).

The spelling of 21432402001 in words is "twenty-one billion, four hundred thirty-two million, four hundred two thousand, one".