21120220021023 has 32 divisors (see below), whose sum is σ = 32687683553280. Its totient is φ = 13461780303360.

The previous prime is 21120220021007. The next prime is 21120220021049. The reversal of 21120220021023 is 32012002202112.

21120220021023 is a `hidden beast` number, since 211 + 2 + 0 + 220 + 0 + 210 + 23 = 666.

It is not a de Polignac number, because 21120220021023 - 2⁴ = 21120220021007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21120220020987 and 21120220021005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120220020023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 151937986 + ... + 152076927.

It is an arithmetic number, because the mean of its divisors is an integer number (1021490111040).

Almost surely, 2^{21120220021023} is an apocalyptic number.

21120220021023 is a deficient number, since it is larger than the sum of its proper divisors (11567463532257).

21120220021023 is a wasteful number, since it uses less digits than its factorization.

21120220021023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304015036 (or 304015030 counting only the distinct ones).

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

Adding to 21120220021023 its reverse (32012002202112), we get a palindrome (53132222223135).

The spelling of 21120220021023 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty million, twenty-one thousand, twenty-three".