21624402007730 has 8 divisors (see below), whose sum is σ = 38923923613932. Its totient is φ = 8649760803088.

The previous prime is 21624402007729. The next prime is 21624402007771. The reversal of 21624402007730 is 3770020442612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20439920228809 + 1184481778921 = 4521053^2 + 1088339^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21624402007730² (a number of 27 digits) contains 22 as substring.

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, 1081220100377 + ... + 1081220100396.

Almost surely, 2^{21624402007730} is an apocalyptic number.

21624402007730 is a deficient number, since it is larger than the sum of its proper divisors (17299521606202).

21624402007730 is a wasteful number, since it uses less digits than its factorization.

21624402007730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2162440200780.

The product of its (nonzero) digits is 112896, while the sum is 38.

The spelling of 21624402007730 in words is "twenty-one trillion, six hundred twenty-four billion, four hundred two million, seven thousand, seven hundred thirty".