21010220223 has 16 divisors (see below), whose sum is σ = 28212197376. Its totient is φ = 13907799360.

The previous prime is 21010220221. The next prime is 21010220243. The reversal of 21010220223 is 32202201012.

It is a happy number.

It is not a de Polignac number, because 21010220223 - 2¹ = 21010220221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010220221) 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, 279915 + ... + 346947.

It is an arithmetic number, because the mean of its divisors is an integer number (1763262336).

Almost surely, 2^21010220223 is an apocalyptic number.

21010220223 is a deficient number, since it is larger than the sum of its proper divisors (7201977153).

21010220223 is a wasteful number, since it uses less digits than its factorization.

21010220223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67774.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21010220223 its reverse (32202201012), we get a palindrome (53212421235).

The spelling of 21010220223 in words is "twenty-one billion, ten million, two hundred twenty thousand, two hundred twenty-three".