21221550016441 has 8 divisors (see below), whose sum is σ = 21880838368224. Its totient is φ = 20569796388960.

The previous prime is 21221550016409. The next prime is 21221550016451. The reversal of 21221550016441 is 14461005512212.

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 21221550016441 - 2⁵ = 21221550016409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21221550016397 and 21221550016406.

It is not an unprimeable number, because it can be changed into a prime (21221550016451) 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, 1883675356 + ... + 1883686621.

It is an arithmetic number, because the mean of its divisors is an integer number (2735104796028).

Almost surely, 2^{21221550016441} is an apocalyptic number.

It is an amenable number.

21221550016441 is a deficient number, since it is larger than the sum of its proper divisors (659288351783).

21221550016441 is a wasteful number, since it uses less digits than its factorization.

21221550016441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3767362151.

The product of its (nonzero) digits is 19200, while the sum is 34.

Adding to 21221550016441 its reverse (14461005512212), we get a palindrome (35682555528653).

The spelling of 21221550016441 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred fifty million, sixteen thousand, four hundred forty-one".