23221001405521 has 8 divisors (see below), whose sum is σ = 23249511082880. Its totient is φ = 23192492931792.

The previous prime is 23221001405501. The next prime is 23221001405557. The reversal of 23221001405521 is 12550410012232.

It is a happy number.

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 23221001405521 - 2⁵ = 23221001405489 is a prime.

It is a super-3 number, since 3×23221001405521³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23221001405521.

It is not an unprimeable number, because it can be changed into a prime (23221001405501) 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, 41940136 + ... + 42490198.

It is an arithmetic number, because the mean of its divisors is an integer number (2906188885360).

Almost surely, 2^{23221001405521} is an apocalyptic number.

It is an amenable number.

23221001405521 is a deficient number, since it is larger than the sum of its proper divisors (28509677359).

23221001405521 is an equidigital number, since it uses as much as digits as its factorization.

23221001405521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601815.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 23221001405521 its reverse (12550410012232), we get a palindrome (35771411417753).

The spelling of 23221001405521 in words is "twenty-three trillion, two hundred twenty-one billion, one million, four hundred five thousand, five hundred twenty-one".