21031250434 has 8 divisors (see below), whose sum is σ = 31552996608. Its totient is φ = 10513584900.

The previous prime is 21031250369. The next prime is 21031250441. The reversal of 21031250434 is 43405213012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21031250399 and 21031250408.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1007242 + ... + 1027909.

It is an arithmetic number, because the mean of its divisors is an integer number (3944124576).

Almost surely, 2^21031250434 is an apocalyptic number.

21031250434 is a deficient number, since it is larger than the sum of its proper divisors (10521746174).

21031250434 is a wasteful number, since it uses less digits than its factorization.

21031250434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040320.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21031250434 its reverse (43405213012), we get a palindrome (64436463446).

The spelling of 21031250434 in words is "twenty-one billion, thirty-one million, two hundred fifty thousand, four hundred thirty-four".