21012213440223 has 24 divisors (see below), whose sum is σ = 31672178124288. Its totient is φ = 13398417589392.

The previous prime is 21012213440173. The next prime is 21012213440249. The reversal of 21012213440223 is 32204431221012.

21012213440223 is a `hidden beast` number, since 2 + 1 + 0 + 1 + 2 + 213 + 440 + 2 + 2 + 3 = 666.

It is not a de Polignac number, because 21012213440223 - 2¹⁷ = 21012213309151 is a prime.

It is a super-2 number, since 2×21012213440223² (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 (21012213440923) by changing a digit.

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, 1577886 + ... + 6671892.

It is an arithmetic number, because the mean of its divisors is an integer number (1319674088512).

Almost surely, 2^{21012213440223} is an apocalyptic number.

21012213440223 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21012213440223 is a deficient number, since it is larger than the sum of its proper divisors (10659964684065).

21012213440223 is a wasteful number, since it uses less digits than its factorization.

21012213440223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5113963 (or 5113960 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 21012213440223 its reverse (32204431221012), we get a palindrome (53216644661235).

The spelling of 21012213440223 in words is "twenty-one trillion, twelve billion, two hundred thirteen million, four hundred forty thousand, two hundred twenty-three".