215451201101 has 4 divisors (see below), whose sum is σ = 215453563392. Its totient is φ = 215448838812.

The previous prime is 215451201079. The next prime is 215451201103. The reversal of 215451201101 is 101102154512.

It is a happy number.

215451201101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 215451201101 - 2³⁴ = 198271331917 is a prime.

It is a super-2 number, since 2×215451201101² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215451201103) 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, 1038605 + ... + 1228658.

It is an arithmetic number, because the mean of its divisors is an integer number (53863390848).

Almost surely, 2^215451201101 is an apocalyptic number.

It is an amenable number.

215451201101 is a deficient number, since it is larger than the sum of its proper divisors (2362291).

215451201101 is an equidigital number, since it uses as much as digits as its factorization.

215451201101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2362290.

The product of its (nonzero) digits is 400, while the sum is 23.

Adding to 215451201101 its reverse (101102154512), we get a palindrome (316553355613).

The spelling of 215451201101 in words is "two hundred fifteen billion, four hundred fifty-one million, two hundred one thousand, one hundred one".