21121020223 has 8 divisors (see below), whose sum is σ = 22266224640. Its totient is φ = 20004808440.

The previous prime is 21121020211. The next prime is 21121020229. The reversal of 21121020223 is 32202012112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21121020223 - 2²¹ = 21118923071 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21121020197 and 21121020206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121020229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7246663 + ... + 7249576.

It is an arithmetic number, because the mean of its divisors is an integer number (2783278080).

Almost surely, 2^21121020223 is an apocalyptic number.

21121020223 is a deficient number, since it is larger than the sum of its proper divisors (1145204417).

21121020223 is a wasteful number, since it uses less digits than its factorization.

21121020223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14496317.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21121020223 its reverse (32202012112), we get a palindrome (53323032335).

The spelling of 21121020223 in words is "twenty-one billion, one hundred twenty-one million, twenty thousand, two hundred twenty-three".