21221313103 has 8 divisors (see below), whose sum is σ = 21609209808. Its totient is φ = 20836927104.

The previous prime is 21221313083. The next prime is 21221313109. The reversal of 21221313103 is 30131312212.

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

It is a cyclic number.

It is not a de Polignac number, because 21221313103 - 2²⁵ = 21187758671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221313109) 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, 865476 + ... + 889657.

It is an arithmetic number, because the mean of its divisors is an integer number (2701151226).

Almost surely, 2^21221313103 is an apocalyptic number.

21221313103 is a deficient number, since it is larger than the sum of its proper divisors (387896705).

21221313103 is a wasteful number, since it uses less digits than its factorization.

21221313103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1755353.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21221313103 its reverse (30131312212), we get a palindrome (51352625315).

The spelling of 21221313103 in words is "twenty-one billion, two hundred twenty-one million, three hundred thirteen thousand, one hundred three".