21121212330231 has 16 divisors (see below), whose sum is σ = 30328077308256. Its totient is φ = 12997590834816.

The previous prime is 21121212330227. The next prime is 21121212330233. The reversal of 21121212330231 is 13203321212112.

It is not a de Polignac number, because 21121212330231 - 2² = 21121212330227 is a prime.

It is a super-2 number, since 2×21121212330231² (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 (21121212330233) 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, 5299321 + ... + 8386013.

It is an arithmetic number, because the mean of its divisors is an integer number (1895504831766).

Almost surely, 2^{21121212330231} is an apocalyptic number.

21121212330231 is a deficient number, since it is larger than the sum of its proper divisors (9206864978025).

21121212330231 is a wasteful number, since it uses less digits than its factorization.

21121212330231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3262162.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 21121212330231 its reverse (13203321212112), we get a palindrome (34324533542343).

The spelling of 21121212330231 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twelve million, three hundred thirty thousand, two hundred thirty-one".