21143030452 has 6 divisors (see below), whose sum is σ = 37000303298. Its totient is φ = 10571515224.

The previous prime is 21143030443. The next prime is 21143030479. The reversal of 21143030452 is 25403034112.

It can be written as a sum of positive squares in only one way, i.e., 17751831696 + 3391198756 = 133236^2 + 58234^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2642878803 + ... + 2642878810.

Almost surely, 2^21143030452 is an apocalyptic number.

It is an amenable number.

21143030452 is a deficient number, since it is larger than the sum of its proper divisors (15857272846).

21143030452 is a wasteful number, since it uses less digits than its factorization.

21143030452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5285757617 (or 5285757615 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21143030452 its reverse (25403034112), we get a palindrome (46546064564).

The spelling of 21143030452 in words is "twenty-one billion, one hundred forty-three million, thirty thousand, four hundred fifty-two".