21043325354 has 4 divisors (see below), whose sum is σ = 31564988034. Its totient is φ = 10521662676.

The previous prime is 21043325323. The next prime is 21043325371. The reversal of 21043325354 is 45352334012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10978219729 + 10065105625 = 104777^2 + 100325^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21043325354.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5260831337 + ... + 5260831340.

Almost surely, 2^21043325354 is an apocalyptic number.

21043325354 is a deficient number, since it is larger than the sum of its proper divisors (10521662680).

21043325354 is a wasteful number, since it uses less digits than its factorization.

21043325354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10521662679.

The product of its (nonzero) digits is 43200, while the sum is 32.

Adding to 21043325354 its reverse (45352334012), we get a palindrome (66395659366).

The spelling of 21043325354 in words is "twenty-one billion, forty-three million, three hundred twenty-five thousand, three hundred fifty-four".