21432002331 has 16 divisors (see below), whose sum is σ = 28702221440. Its totient is φ = 14224982400.

The previous prime is 21432002311. The next prime is 21432002341. The reversal of 21432002331 is 13320023412.

It is not a de Polignac number, because 21432002331 - 2⁷ = 21432002203 is a prime.

It is a super-2 number, since 2×21432002331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21432002298 and 21432002307.

It is not an unprimeable number, because it can be changed into a prime (21432002311) 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, 1009140 + ... + 1030158.

It is an arithmetic number, because the mean of its divisors is an integer number (1793888840).

Almost surely, 2^21432002331 is an apocalyptic number.

21432002331 is a deficient number, since it is larger than the sum of its proper divisors (7270219109).

21432002331 is a wasteful number, since it uses less digits than its factorization.

21432002331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22506.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21432002331 its reverse (13320023412), we get a palindrome (34752025743).

The spelling of 21432002331 in words is "twenty-one billion, four hundred thirty-two million, two thousand, three hundred thirty-one".