21503432334 has 64 divisors (see below), whose sum is σ = 44197171200. Its totient is φ = 6972612192.

The previous prime is 21503432333. The next prime is 21503432347. The reversal of 21503432334 is 43323430512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21503432333) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24352257 + ... + 24353139.

It is an arithmetic number, because the mean of its divisors is an integer number (690580800).

Almost surely, 2^21503432334 is an apocalyptic number.

21503432334 is an abundant number, since it is smaller than the sum of its proper divisors (22693738866).

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

21503432334 is a wasteful number, since it uses less digits than its factorization.

21503432334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1669.

The product of its (nonzero) digits is 25920, while the sum is 30.

Adding to 21503432334 its reverse (43323430512), we get a palindrome (64826862846).

The spelling of 21503432334 in words is "twenty-one billion, five hundred three million, four hundred thirty-two thousand, three hundred thirty-four".