21441221102154 has 64 divisors (see below), whose sum is σ = 51590361139200. Its totient is φ = 5803361961408.

The previous prime is 21441221102153. The next prime is 21441221102219. The reversal of 21441221102154 is 45120112214412.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21441221102153) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 16382404 + ... + 17642720.

It is an arithmetic number, because the mean of its divisors is an integer number (806099392800).

Almost surely, 2^{21441221102154} is an apocalyptic number.

21441221102154 is an abundant number, since it is smaller than the sum of its proper divisors (30149140037046).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21441221102154 is a wasteful number, since it uses less digits than its factorization.

21441221102154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281667.

The product of its (nonzero) digits is 5120, while the sum is 30.

Adding to 21441221102154 its reverse (45120112214412), we get a palindrome (66561333316566).

The spelling of 21441221102154 in words is "twenty-one trillion, four hundred forty-one billion, two hundred twenty-one million, one hundred two thousand, one hundred fifty-four".