21221210030 has 8 divisors (see below), whose sum is σ = 38198178072. Its totient is φ = 8488484008.

The previous prime is 21221209957. The next prime is 21221210033. The reversal of 21221210030 is 3001212212.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21221209987 and 21221210014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221210033) 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, 1061060492 + ... + 1061060511.

It is an arithmetic number, because the mean of its divisors is an integer number (4774772259).

Almost surely, 2^21221210030 is an apocalyptic number.

21221210030 is a deficient number, since it is larger than the sum of its proper divisors (16976968042).

21221210030 is a wasteful number, since it uses less digits than its factorization.

21221210030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122121010.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21221210030 its reverse (3001212212), we get a palindrome (24222422242).

The spelling of 21221210030 in words is "twenty-one billion, two hundred twenty-one million, two hundred ten thousand, thirty".