21220121010344 has 32 divisors (see below), whose sum is σ = 39874468320000. Its totient is φ = 10586933548032.

The previous prime is 21220121010311. The next prime is 21220121010353. The reversal of 21220121010344 is 44301012102212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42220232 + ... + 42719880.

It is an arithmetic number, because the mean of its divisors is an integer number (1246077135000).

Almost surely, 2^{21220121010344} is an apocalyptic number.

It is an amenable number.

21220121010344 is a deficient number, since it is larger than the sum of its proper divisors (18654347309656).

21220121010344 is a wasteful number, since it uses less digits than its factorization.

21220121010344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511217 (or 511213 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 21220121010344 its reverse (44301012102212), we get a palindrome (65521133112556).

The spelling of 21220121010344 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, ten thousand, three hundred forty-four".