21200300204434 has 32 divisors (see below), whose sum is σ = 34609209505920. Its totient is φ = 9681217777152.

The previous prime is 21200300204393. The next prime is 21200300204581. The reversal of 21200300204434 is 43440200300212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21200300204399 and 21200300204408.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8033907 + ... + 10341385.

It is an arithmetic number, because the mean of its divisors is an integer number (1081537797060).

Almost surely, 2^{21200300204434} is an apocalyptic number.

21200300204434 is a deficient number, since it is larger than the sum of its proper divisors (13408909301486).

21200300204434 is a wasteful number, since it uses less digits than its factorization.

21200300204434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2311234.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 21200300204434 its reverse (43440200300212), we get a palindrome (64640500504646).

The spelling of 21200300204434 in words is "twenty-one trillion, two hundred billion, three hundred million, two hundred four thousand, four hundred thirty-four".