21221240120403 has 8 divisors (see below), whose sum is σ = 28295840220816. Its totient is φ = 14147066716800.

The previous prime is 21221240120371. The next prime is 21221240120407. The reversal of 21221240120403 is 30402104212212.

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

It is not a de Polignac number, because 21221240120403 - 2⁵ = 21221240120371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221240120407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106558138 + ... + 106757103.

It is an arithmetic number, because the mean of its divisors is an integer number (3536980027602).

Almost surely, 2^{21221240120403} is an apocalyptic number.

21221240120403 is a deficient number, since it is larger than the sum of its proper divisors (7074600100413).

21221240120403 is a wasteful number, since it uses less digits than its factorization.

21221240120403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213348405.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21221240120403 its reverse (30402104212212), we get a palindrome (51623344332615).

The spelling of 21221240120403 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred forty million, one hundred twenty thousand, four hundred three".