21121010324 has 12 divisors (see below), whose sum is σ = 39135989844. Its totient is φ = 9939298944.

The previous prime is 21121010321. The next prime is 21121010371. The reversal of 21121010324 is 42301012112.

It can be written as a sum of positive squares in 2 ways, for example, as 6869425924 + 14251584400 = 82882^2 + 119380^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121010321) 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, 155301479 + ... + 155301614.

It is an arithmetic number, because the mean of its divisors is an integer number (3261332487).

Almost surely, 2^21121010324 is an apocalyptic number.

It is an amenable number.

21121010324 is a deficient number, since it is larger than the sum of its proper divisors (18014979520).

21121010324 is a wasteful number, since it uses less digits than its factorization.

21121010324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310603114 (or 310603112 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21121010324 its reverse (42301012112), we get a palindrome (63422022436).

The spelling of 21121010324 in words is "twenty-one billion, one hundred twenty-one million, ten thousand, three hundred twenty-four".