21243500030 has 16 divisors (see below), whose sum is σ = 38259216864. Its totient is φ = 8492751840.

The previous prime is 21243499987. The next prime is 21243500041. The reversal of 21243500030 is 3000534212.

It is a happy number.

It is a super-2 number, since 2×21243500030² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21243499975 and 21243500011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 561797 + ... + 598416.

It is an arithmetic number, because the mean of its divisors is an integer number (2391201054).

Almost surely, 2^21243500030 is an apocalyptic number.

21243500030 is a deficient number, since it is larger than the sum of its proper divisors (17015716834).

21243500030 is a wasteful number, since it uses less digits than its factorization.

21243500030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162051.

The product of its (nonzero) digits is 720, while the sum is 20.

The spelling of 21243500030 in words is "twenty-one billion, two hundred forty-three million, five hundred thousand, thirty".