21150011402221 has 8 divisors (see below), whose sum is σ = 22777151952800. Its totient is φ = 19522901794032.

The previous prime is 21150011402173. The next prime is 21150011402239. The reversal of 21150011402221 is 12220411005112.

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

It is not a de Polignac number, because 21150011402221 - 2⁴¹ = 18950988146669 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21150011402192 and 21150011402201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150011402291) 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, 6306171 + ... + 9059128.

It is an arithmetic number, because the mean of its divisors is an integer number (2847143994100).

Almost surely, 2^{21150011402221} is an apocalyptic number.

It is an amenable number.

21150011402221 is a deficient number, since it is larger than the sum of its proper divisors (1627140550579).

21150011402221 is a wasteful number, since it uses less digits than its factorization.

21150011402221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15471195.

The product of its (nonzero) digits is 320, while the sum is 22.

Adding to 21150011402221 its reverse (12220411005112), we get a palindrome (33370422407333).

The spelling of 21150011402221 in words is "twenty-one trillion, one hundred fifty billion, eleven million, four hundred two thousand, two hundred twenty-one".