21210121422231 has 16 divisors (see below), whose sum is σ = 32321191065600. Its totient is φ = 12119692118688.

The previous prime is 21210121422227. The next prime is 21210121422241. The reversal of 21210121422231 is 13222412101212.

It is not a de Polignac number, because 21210121422231 - 2² = 21210121422227 is a prime.

It is a super-2 number, since 2×21210121422231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210121422241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15027976 + ... + 16378653.

It is an arithmetic number, because the mean of its divisors is an integer number (2020074441600).

Almost surely, 2^{21210121422231} is an apocalyptic number.

21210121422231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21210121422231 is a deficient number, since it is larger than the sum of its proper divisors (11111069643369).

21210121422231 is a wasteful number, since it uses less digits than its factorization.

21210121422231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31438798.

The product of its (nonzero) digits is 768, while the sum is 24.

Adding to 21210121422231 its reverse (13222412101212), we get a palindrome (34432533523443).

The spelling of 21210121422231 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-one million, four hundred twenty-two thousand, two hundred thirty-one".