21222520126155 has 24 divisors (see below), whose sum is σ = 36960041386320. Its totient is φ = 11265034374720.

The previous prime is 21222520126133. The next prime is 21222520126207. The reversal of 21222520126155 is 55162102522212.

21222520126155 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 2 + 5 + 20 + 12 + 615 + 5 = 666.

It is not a de Polignac number, because 21222520126155 - 2⁶ = 21222520126091 is a prime.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1117553440 + ... + 1117572429.

It is an arithmetic number, because the mean of its divisors is an integer number (1540001724430).

Almost surely, 2^{21222520126155} is an apocalyptic number.

21222520126155 is a deficient number, since it is larger than the sum of its proper divisors (15737521260165).

21222520126155 is a wasteful number, since it uses less digits than its factorization.

21222520126155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2235126091 (or 2235126088 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

Adding to 21222520126155 its reverse (55162102522212), we get a palindrome (76384622648367).

The spelling of 21222520126155 in words is "twenty-one trillion, two hundred twenty-two billion, five hundred twenty million, one hundred twenty-six thousand, one hundred fifty-five".