21212030030 has 32 divisors (see below), whose sum is σ = 38310602400. Its totient is φ = 8456200192.

The previous prime is 21212030029. The next prime is 21212030069. The reversal of 21212030030 is 3003021212.

It is a happy number.

21212030030 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 21212029987 and 21212030014.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5901914 + ... + 5905506.

It is an arithmetic number, because the mean of its divisors is an integer number (1197206325).

Almost surely, 2^21212030030 is an apocalyptic number.

21212030030 is a deficient number, since it is larger than the sum of its proper divisors (17098572370).

21212030030 is a wasteful number, since it uses less digits than its factorization.

21212030030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5428.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21212030030 its reverse (3003021212), we get a palindrome (24215051242).

The spelling of 21212030030 in words is "twenty-one billion, two hundred twelve million, thirty thousand, thirty".