21032402344 has 8 divisors (see below), whose sum is σ = 39435754410. Its totient is φ = 10516201168.

The previous prime is 21032402323. The next prime is 21032402353. The reversal of 21032402344 is 44320423012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16297586244 + 4734816100 = 127662^2 + 68810^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1314525139 + ... + 1314525154.

Almost surely, 2^21032402344 is an apocalyptic number.

It is an amenable number.

21032402344 is a deficient number, since it is larger than the sum of its proper divisors (18403352066).

21032402344 is a wasteful number, since it uses less digits than its factorization.

21032402344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2629050299 (or 2629050295 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 21032402344 its reverse (44320423012), we get a palindrome (65352825356).

The spelling of 21032402344 in words is "twenty-one billion, thirty-two million, four hundred two thousand, three hundred forty-four".