21146235304 has 8 divisors (see below), whose sum is σ = 39649191210. Its totient is φ = 10573117648.

The previous prime is 21146235293. The next prime is 21146235323. The reversal of 21146235304 is 40353264112.

It can be written as a sum of positive squares in only one way, i.e., 20560692100 + 585543204 = 143390^2 + 24198^2 .

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, 1321639699 + ... + 1321639714.

Almost surely, 2^21146235304 is an apocalyptic number.

It is an amenable number.

21146235304 is a deficient number, since it is larger than the sum of its proper divisors (18502955906).

21146235304 is a wasteful number, since it uses less digits than its factorization.

21146235304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2643279419 (or 2643279415 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 21146235304 its reverse (40353264112), we get a palindrome (61499499416).

The spelling of 21146235304 in words is "twenty-one billion, one hundred forty-six million, two hundred thirty-five thousand, three hundred four".