21122002255 has 8 divisors (see below), whose sum is σ = 25724707632. Its totient is φ = 16645398528.

The previous prime is 21122002201. The next prime is 21122002259. The reversal of 21122002255 is 55220022112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21122002255 - 2⁹ = 21122001743 is a prime.

It is a super-2 number, since 2×21122002255² (a number of 21 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 (21122002259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31525042 + ... + 31525711.

It is an arithmetic number, because the mean of its divisors is an integer number (3215588454).

Almost surely, 2^21122002255 is an apocalyptic number.

21122002255 is a deficient number, since it is larger than the sum of its proper divisors (4602705377).

21122002255 is an equidigital number, since it uses as much as digits as its factorization.

21122002255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63050825.

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 21122002255 its reverse (55220022112), we get a palindrome (76342024367).

The spelling of 21122002255 in words is "twenty-one billion, one hundred twenty-two million, two thousand, two hundred fifty-five".