21221242030 has 16 divisors (see below), whose sum is σ = 38200001760. Its totient is φ = 8488104352.

The previous prime is 21221242019. The next prime is 21221242033. The reversal of 21221242030 is 3024212212.

It is a super-2 number, since 2×21221242030² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21221241989 and 21221242007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221242033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288927 + ... + 354853.

It is an arithmetic number, because the mean of its divisors is an integer number (2387500110).

Almost surely, 2^21221242030 is an apocalyptic number.

21221242030 is a deficient number, since it is larger than the sum of its proper divisors (16978759730).

21221242030 is a wasteful number, since it uses less digits than its factorization.

21221242030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98123.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21221242030 its reverse (3024212212), we get a palindrome (24245454242).

The spelling of 21221242030 in words is "twenty-one billion, two hundred twenty-one million, two hundred forty-two thousand, thirty".