22101521 has 8 divisors (see below), whose sum is σ = 23857344. Its totient is φ = 20353680.

The previous prime is 22101517. The next prime is 22101523. The reversal of 22101521 is 12510122.

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 22101521 - 2² = 22101517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22101496 and 22101505.

It is not an unprimeable number, because it can be changed into a prime (22101523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4586 + ... + 8076.

It is an arithmetic number, because the mean of its divisors is an integer number (2982168).

Almost surely, 2^22101521 is an apocalyptic number.

It is an amenable number.

22101521 is a deficient number, since it is larger than the sum of its proper divisors (1755823).

22101521 is a wasteful number, since it uses less digits than its factorization.

22101521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3991.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 22101521 is about 4701.2254785322. The cubic root of 22101521 is about 280.6342806242.

Adding to 22101521 its reverse (12510122), we get a palindrome (34611643).

It can be divided in two parts, 22101 and 521, that added together give a palindrome (22622).

The spelling of 22101521 in words is "twenty-two million, one hundred one thousand, five hundred twenty-one".