21641031434 has 16 divisors (see below), whose sum is σ = 35417056896. Its totient is φ = 9835593600.

The previous prime is 21641031431. The next prime is 21641031481. The reversal of 21641031434 is 43413014612.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21641031397 and 21641031406.

It is not an unprimeable number, because it can be changed into a prime (21641031431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129914 + ... + 245274.

It is an arithmetic number, because the mean of its divisors is an integer number (2213566056).

Almost surely, 2^21641031434 is an apocalyptic number.

21641031434 is a deficient number, since it is larger than the sum of its proper divisors (13776025462).

21641031434 is a wasteful number, since it uses less digits than its factorization.

21641031434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123901.

The product of its (nonzero) digits is 6912, while the sum is 29.

The spelling of 21641031434 in words is "twenty-one billion, six hundred forty-one million, thirty-one thousand, four hundred thirty-four".