21220033412 has 12 divisors (see below), whose sum is σ = 37241465100. Its totient is φ = 10579614816.

The previous prime is 21220033411. The next prime is 21220033447. The reversal of 21220033412 is 21433002212.

It can be written as a sum of positive squares in 2 ways, for example, as 18244985476 + 2975047936 = 135074^2 + 54544^2 .

It is not an unprimeable number, because it can be changed into a prime (21220033411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7598903 + ... + 7601694.

It is an arithmetic number, because the mean of its divisors is an integer number (3103455425).

Almost surely, 2^21220033412 is an apocalyptic number.

It is an amenable number.

21220033412 is a deficient number, since it is larger than the sum of its proper divisors (16021431688).

21220033412 is a wasteful number, since it uses less digits than its factorization.

21220033412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15200950 (or 15200948 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21220033412 its reverse (21433002212), we get a palindrome (42653035624).

The spelling of 21220033412 in words is "twenty-one billion, two hundred twenty million, thirty-three thousand, four hundred twelve".