21014434332221 has 16 divisors (see below), whose sum is σ = 24278804386560. Its totient is φ = 17976229793280.

The previous prime is 21014434332197. The next prime is 21014434332263. The reversal of 21014434332221 is 12223343441012.

It is a happy number.

It is not a de Polignac number, because 21014434332221 - 2²² = 21014430137917 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 (21014434332271) 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, 11773301 + ... + 13440218.

It is an arithmetic number, because the mean of its divisors is an integer number (1517425274160).

Almost surely, 2^{21014434332221} is an apocalyptic number.

It is an amenable number.

21014434332221 is a deficient number, since it is larger than the sum of its proper divisors (3264370054339).

21014434332221 is a wasteful number, since it uses less digits than its factorization.

21014434332221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25218004.

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 21014434332221 its reverse (12223343441012), we get a palindrome (33237777773233).

The spelling of 21014434332221 in words is "twenty-one trillion, fourteen billion, four hundred thirty-four million, three hundred thirty-two thousand, two hundred twenty-one".