21213600061151 has 4 divisors (see below), whose sum is σ = 21213936938832. Its totient is φ = 21213263183472.

The previous prime is 21213600061111. The next prime is 21213600061229. The reversal of 21213600061151 is 15116000631212.

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

It is a cyclic number.

It is not a de Polignac number, because 21213600061151 - 2¹⁰ = 21213600060127 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 (21213600061111) 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, 168344366 + ... + 168470331.

It is an arithmetic number, because the mean of its divisors is an integer number (5303484234708).

Almost surely, 2^{21213600061151} is an apocalyptic number.

21213600061151 is a deficient number, since it is larger than the sum of its proper divisors (336877681).

21213600061151 is an equidigital number, since it uses as much as digits as its factorization.

21213600061151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336877680.

The product of its (nonzero) digits is 2160, while the sum is 29.

Adding to 21213600061151 its reverse (15116000631212), we get a palindrome (36329600692363).

The spelling of 21213600061151 in words is "twenty-one trillion, two hundred thirteen billion, six hundred million, sixty-one thousand, one hundred fifty-one".