21221343014421 has 16 divisors (see below), whose sum is σ = 30868871459328. Its totient is φ = 12860810242800.

The previous prime is 21221343014407. The next prime is 21221343014467. The reversal of 21221343014421 is 12441034312212.

It is a happy number.

It is not a de Polignac number, because 21221343014421 - 2¹³ = 21221343006229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221343010421) 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, 14537065 + ... + 15930126.

It is an arithmetic number, because the mean of its divisors is an integer number (1929304466208).

Almost surely, 2^{21221343014421} is an apocalyptic number.

It is an amenable number.

21221343014421 is a deficient number, since it is larger than the sum of its proper divisors (9647528444907).

21221343014421 is a wasteful number, since it uses less digits than its factorization.

21221343014421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30488312.

The product of its (nonzero) digits is 9216, while the sum is 30.

Adding to 21221343014421 its reverse (12441034312212), we get a palindrome (33662377326633).

The spelling of 21221343014421 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred forty-three million, fourteen thousand, four hundred twenty-one".