21432221034 has 96 divisors (see below), whose sum is σ = 50375385216. Its totient is φ = 6060862080.

The previous prime is 21432221021. The next prime is 21432221047. The reversal of 21432221034 is 43012223412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21432221021) and next prime (21432221047).

It is a junction number, because it is equal to n+sod(n) for n = 21432220995 and 21432221013.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14354392 + ... + 14355884.

It is an arithmetic number, because the mean of its divisors is an integer number (524743596).

Almost surely, 2^21432221034 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21432221034, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25187692608).

21432221034 is an abundant number, since it is smaller than the sum of its proper divisors (28943164182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21432221034 is a wasteful number, since it uses less digits than its factorization.

21432221034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980 (or 1973 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21432221034 its reverse (43012223412), we get a palindrome (64444444446).

The spelling of 21432221034 in words is "twenty-one billion, four hundred thirty-two million, two hundred twenty-one thousand, thirty-four".