21012002120223 has 40 divisors (see below), whose sum is σ = 33577295697792. Its totient is φ = 13048083707904.

The previous prime is 21012002120209. The next prime is 21012002120261. The reversal of 21012002120223 is 32202120021012.

21012002120223 is a `hidden beast` number, since 210 + 1 + 20 + 0 + 212 + 0 + 223 = 666.

It is not a de Polignac number, because 21012002120223 - 2⁹ = 21012002119711 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21012002120196 and 21012002120205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012002120203) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 78522415 + ... + 78789552.

Almost surely, 2^{21012002120223} is an apocalyptic number.

21012002120223 is a deficient number, since it is larger than the sum of its proper divisors (12565293577569).

21012002120223 is a wasteful number, since it uses less digits than its factorization.

21012002120223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157312093 (or 157312084 counting only the distinct ones).

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

Adding to 21012002120223 its reverse (32202120021012), we get a palindrome (53214122141235).

The spelling of 21012002120223 in words is "twenty-one trillion, twelve billion, two million, one hundred twenty thousand, two hundred twenty-three".