21221406415103 has 16 divisors (see below), whose sum is σ = 21987186794496. Its totient is φ = 20469073178400.

The previous prime is 21221406415063. The next prime is 21221406415159. The reversal of 21221406415103 is 30151460412212.

It is a cyclic number.

It is not a de Polignac number, because 21221406415103 - 2⁶ = 21221406415039 is a prime.

It is a super-3 number, since 3×21221406415103³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21221406415103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221406415193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4715675 + ... + 8042412.

It is an arithmetic number, because the mean of its divisors is an integer number (1374199174656).

Almost surely, 2^{21221406415103} is an apocalyptic number.

21221406415103 is a deficient number, since it is larger than the sum of its proper divisors (765780379393).

21221406415103 is a wasteful number, since it uses less digits than its factorization.

21221406415103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12758614.

The product of its (nonzero) digits is 11520, while the sum is 32.

Adding to 21221406415103 its reverse (30151460412212), we get a palindrome (51372866827315).

The spelling of 21221406415103 in words is "twenty-one trillion, two hundred twenty-one billion, four hundred six million, four hundred fifteen thousand, one hundred three".