21945210434 has 32 divisors (see below), whose sum is σ = 38897335296. Its totient is φ = 9086837760.

The previous prime is 21945210431. The next prime is 21945210449. The reversal of 21945210434 is 43401254912.

It is a junction number, because it is equal to n+sod(n) for n = 21945210394 and 21945210403.

It is not an unprimeable number, because it can be changed into a prime (21945210431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226802 + ... + 308754.

It is an arithmetic number, because the mean of its divisors is an integer number (1215541728).

Almost surely, 2^21945210434 is an apocalyptic number.

21945210434 is a deficient number, since it is larger than the sum of its proper divisors (16952124862).

21945210434 is a wasteful number, since it uses less digits than its factorization.

21945210434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82610.

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 21945210434 in words is "twenty-one billion, nine hundred forty-five million, two hundred ten thousand, four hundred thirty-four".