21002215324 has 12 divisors (see below), whose sum is σ = 36780655464. Its totient is φ = 10493456624.

The previous prime is 21002215313. The next prime is 21002215343. The reversal of 21002215324 is 42351220012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21002215295 and 21002215304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1906582 + ... + 1917565.

It is an arithmetic number, because the mean of its divisors is an integer number (3065054622).

Almost surely, 2^21002215324 is an apocalyptic number.

It is an amenable number.

21002215324 is a deficient number, since it is larger than the sum of its proper divisors (15778440140).

21002215324 is a wasteful number, since it uses less digits than its factorization.

21002215324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3825524 (or 3825522 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21002215324 its reverse (42351220012), we get a palindrome (63353435336).

The spelling of 21002215324 in words is "twenty-one billion, two million, two hundred fifteen thousand, three hundred twenty-four".