21352551101221 has 8 divisors (see below), whose sum is σ = 21372415009920. Its totient is φ = 21332689779072.

The previous prime is 21352551101201. The next prime is 21352551101303. The reversal of 21352551101221 is 12210115525312.

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-21352551101221 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 (21352551101201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16072276 + ... + 17350018.

It is an arithmetic number, because the mean of its divisors is an integer number (2671551876240).

Almost surely, 2^{21352551101221} is an apocalyptic number.

It is an amenable number.

21352551101221 is a deficient number, since it is larger than the sum of its proper divisors (19863908699).

21352551101221 is a wasteful number, since it uses less digits than its factorization.

21352551101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1293275.

The product of its (nonzero) digits is 6000, while the sum is 31.

Adding to 21352551101221 its reverse (12210115525312), we get a palindrome (33562666626533).

The spelling of 21352551101221 in words is "twenty-one trillion, three hundred fifty-two billion, five hundred fifty-one million, one hundred one thousand, two hundred twenty-one".