21215201151 has 4 divisors (see below), whose sum is σ = 28286934872. Its totient is φ = 14143467432.

The previous prime is 21215201141. The next prime is 21215201207. The reversal of 21215201151 is 15110251212.

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

It is not a de Polignac number, because 21215201151 - 2⁶ = 21215201087 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 (21215201141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3535866856 + ... + 3535866861.

It is an arithmetic number, because the mean of its divisors is an integer number (7071733718).

Almost surely, 2^21215201151 is an apocalyptic number.

21215201151 is a deficient number, since it is larger than the sum of its proper divisors (7071733721).

21215201151 is an equidigital number, since it uses as much as digits as its factorization.

21215201151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7071733720.

The product of its (nonzero) digits is 200, while the sum is 21.

Adding to 21215201151 its reverse (15110251212), we get a palindrome (36325452363).

The spelling of 21215201151 in words is "twenty-one billion, two hundred fifteen million, two hundred one thousand, one hundred fifty-one".