21233012212 has 24 divisors (see below), whose sum is σ = 39020317056. Its totient is φ = 10090231008.

The previous prime is 21233012197. The next prime is 21233012233. The reversal of 21233012212 is 21221033212.

It is a super-2 number, since 2×21233012212² (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 21233012212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 720568 + ... + 749455.

It is an arithmetic number, because the mean of its divisors is an integer number (1625846544).

Almost surely, 2^21233012212 is an apocalyptic number.

It is an amenable number.

21233012212 is a deficient number, since it is larger than the sum of its proper divisors (17787304844).

21233012212 is a wasteful number, since it uses less digits than its factorization.

21233012212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470207 (or 1470205 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21233012212 its reverse (21221033212), we get a palindrome (42454045424).

The spelling of 21233012212 in words is "twenty-one billion, two hundred thirty-three million, twelve thousand, two hundred twelve".