21003432430 has 16 divisors (see below), whose sum is σ = 37807837200. Its totient is φ = 8401004352.

The previous prime is 21003432421. The next prime is 21003432581. The reversal of 21003432430 is 3423430012.

It is a happy number.

It is a super-2 number, since 2×21003432430² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 387562 + ... + 438418.

It is an arithmetic number, because the mean of its divisors is an integer number (2362989825).

Almost surely, 2^21003432430 is an apocalyptic number.

21003432430 is a deficient number, since it is larger than the sum of its proper divisors (16804404770).

21003432430 is a wasteful number, since it uses less digits than its factorization.

21003432430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92163.

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21003432430 its reverse (3423430012), we get a palindrome (24426862442).

The spelling of 21003432430 in words is "twenty-one billion, three million, four hundred thirty-two thousand, four hundred thirty".