21521422114447 has 8 divisors (see below), whose sum is σ = 21767357365920. Its totient is φ = 21275578452480.

The previous prime is 21521422114369. The next prime is 21521422114453. The reversal of 21521422114447 is 74441122412512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21521422114447 is a prime.

It is a super-2 number, since 2×21521422114447² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21521422114847) 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, 22424683 + ... + 23364700.

It is an arithmetic number, because the mean of its divisors is an integer number (2720919670740).

Almost surely, 2^{21521422114447} is an apocalyptic number.

21521422114447 is a deficient number, since it is larger than the sum of its proper divisors (245935251473).

21521422114447 is an equidigital number, since it uses as much as digits as its factorization.

21521422114447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45794753.

The product of its digits is 143360, while the sum is 40.

Adding to 21521422114447 its reverse (74441122412512), we get a palindrome (95962544526959).

The spelling of 21521422114447 in words is "twenty-one trillion, five hundred twenty-one billion, four hundred twenty-two million, one hundred fourteen thousand, four hundred forty-seven".