21254423333 has 32 divisors (see below), whose sum is σ = 25454362752. Its totient is φ = 17492428800.

The previous prime is 21254423327. The next prime is 21254423347. The reversal of 21254423333 is 33332445212.

It is not a de Polignac number, because 21254423333 - 2¹⁰ = 21254422309 is a prime.

It is a super-2 number, since 2×21254423333² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21254423333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21254423033) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2227613 + ... + 2237133.

It is an arithmetic number, because the mean of its divisors is an integer number (795448836).

Almost surely, 2^21254423333 is an apocalyptic number.

It is an amenable number.

21254423333 is a deficient number, since it is larger than the sum of its proper divisors (4199939419).

21254423333 is a wasteful number, since it uses less digits than its factorization.

21254423333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9845.

The product of its digits is 51840, while the sum is 32.

Adding to 21254423333 its reverse (33332445212), we get a palindrome (54586868545).

The spelling of 21254423333 in words is "twenty-one billion, two hundred fifty-four million, four hundred twenty-three thousand, three hundred thirty-three".