21152212054601 has 4 divisors (see below), whose sum is σ = 21203928954900. Its totient is φ = 21100495154304.

The previous prime is 21152212054579. The next prime is 21152212054607. The reversal of 21152212054601 is 10645021225112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11236735311376 + 9915476743225 = 3352124^2 + 3148885^2 .

It is a cyclic number.

It is not a de Polignac number, because 21152212054601 - 2⁶ = 21152212054537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21152212054607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25858449536 + ... + 25858450353.

It is an arithmetic number, because the mean of its divisors is an integer number (5300982238725).

Almost surely, 2^{21152212054601} is an apocalyptic number.

It is an amenable number.

21152212054601 is a deficient number, since it is larger than the sum of its proper divisors (51716900299).

21152212054601 is an equidigital number, since it uses as much as digits as its factorization.

21152212054601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51716900298.

The product of its (nonzero) digits is 9600, while the sum is 32.

Adding to 21152212054601 its reverse (10645021225112), we get a palindrome (31797233279713).

The spelling of 21152212054601 in words is "twenty-one trillion, one hundred fifty-two billion, two hundred twelve million, fifty-four thousand, six hundred one".