21001210202223 has 24 divisors (see below), whose sum is σ = 31046212783872. Its totient is φ = 13672711151568.

The previous prime is 21001210202213. The next prime is 21001210202233. The reversal of 21001210202223 is 32220201210012.

21001210202223 is a `hidden beast` number, since 210 + 0 + 1 + 210 + 20 + 2 + 223 = 666.

It is an interprime number because it is at equal distance from previous prime (21001210202213) and next prime (21001210202233).

It is not a de Polignac number, because 21001210202223 - 2¹⁸ = 21001209940079 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21001210202196 and 21001210202205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001210202213) 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, 2826711 + ... + 7070552.

It is an arithmetic number, because the mean of its divisors is an integer number (1293592199328).

Almost surely, 2^{21001210202223} is an apocalyptic number.

21001210202223 is a deficient number, since it is larger than the sum of its proper divisors (10045002581649).

21001210202223 is a wasteful number, since it uses less digits than its factorization.

21001210202223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9902795 (or 9902792 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21001210202223 its reverse (32220201210012), we get a palindrome (53221411412235).

The spelling of 21001210202223 in words is "twenty-one trillion, one billion, two hundred ten million, two hundred two thousand, two hundred twenty-three".