21143452426 has 4 divisors (see below), whose sum is σ = 31715178642. Its totient is φ = 10571726212.

The previous prime is 21143452417. The next prime is 21143452427. The reversal of 21143452426 is 62425434112.

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., 20563846801 + 579605625 = 143401^2 + 24075^2 .

It is a super-4 number, since 4×21143452426⁴ (a number of 42 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21143452391 and 21143452400.

It is not an unprimeable number, because it can be changed into a prime (21143452427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5285863105 + ... + 5285863108.

Almost surely, 2^21143452426 is an apocalyptic number.

21143452426 is a deficient number, since it is larger than the sum of its proper divisors (10571726216).

21143452426 is a wasteful number, since it uses less digits than its factorization.

21143452426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10571726215.

The product of its digits is 46080, while the sum is 34.

Adding to 21143452426 its reverse (62425434112), we get a palindrome (83568886538).

The spelling of 21143452426 in words is "twenty-one billion, one hundred forty-three million, four hundred fifty-two thousand, four hundred twenty-six".