21021244324 has 6 divisors (see below), whose sum is σ = 36787177574. Its totient is φ = 10510622160.

The previous prime is 21021244267. The next prime is 21021244397. The reversal of 21021244324 is 42344212012.

It can be written as a sum of positive squares in only one way, i.e., 16271553600 + 4749690724 = 127560^2 + 68918^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2627655537 + ... + 2627655544.

Almost surely, 2^21021244324 is an apocalyptic number.

It is an amenable number.

21021244324 is a deficient number, since it is larger than the sum of its proper divisors (15765933250).

21021244324 is a wasteful number, since it uses less digits than its factorization.

21021244324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5255311085 (or 5255311083 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21021244324 its reverse (42344212012), we get a palindrome (63365456336).

The spelling of 21021244324 in words is "twenty-one billion, twenty-one million, two hundred forty-four thousand, three hundred twenty-four".