21101122004231 has 4 divisors (see below), whose sum is σ = 21305987266512. Its totient is φ = 20896256741952.

The previous prime is 21101122004201. The next prime is 21101122004269. The reversal of 21101122004231 is 13240022110112.

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 21101122004231 - 2¹⁸ = 21101121742087 is a prime.

It is a super-2 number, since 2×21101122004231² (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 (21101122004201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102432630986 + ... + 102432631191.

It is an arithmetic number, because the mean of its divisors is an integer number (5326496816628).

Almost surely, 2^{21101122004231} is an apocalyptic number.

21101122004231 is a deficient number, since it is larger than the sum of its proper divisors (204865262281).

21101122004231 is a wasteful number, since it uses less digits than its factorization.

21101122004231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204865262280.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21101122004231 its reverse (13240022110112), we get a palindrome (34341144114343).

The spelling of 21101122004231 in words is "twenty-one trillion, one hundred one billion, one hundred twenty-two million, four thousand, two hundred thirty-one".