21122154433151 has 4 divisors (see below), whose sum is σ = 21136023216312. Its totient is φ = 21108285649992.

The previous prime is 21122154433141. The next prime is 21122154433183. The reversal of 21122154433151 is 15133445122112.

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 21122154433151 - 2¹⁸ = 21122154171007 is a prime.

It is a super-2 number, since 2×21122154433151² (a number of 27 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 (21122154433141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6934389296 + ... + 6934392341.

It is an arithmetic number, because the mean of its divisors is an integer number (5284005804078).

Almost surely, 2^{21122154433151} is an apocalyptic number.

21122154433151 is a deficient number, since it is larger than the sum of its proper divisors (13868783161).

21122154433151 is a wasteful number, since it uses less digits than its factorization.

21122154433151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13868783160.

The product of its digits is 28800, while the sum is 35.

Adding to 21122154433151 its reverse (15133445122112), we get a palindrome (36255599555263).

The spelling of 21122154433151 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred fifty-four million, four hundred thirty-three thousand, one hundred fifty-one".