21202120021023 has 12 divisors (see below), whose sum is σ = 30626367888168. Its totient is φ = 14134246643760.

The previous prime is 21202120021013. The next prime is 21202120021063. The reversal of 21202120021023 is 32012002120212.

21202120021023 is a `hidden beast` number, since 212 + 0 + 21 + 200 + 210 + 23 = 666.

It is not a de Polignac number, because 21202120021023 - 2⁶ = 21202120020959 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21202120020987 and 21202120021005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202120021013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41401113 + ... + 41910098.

It is an arithmetic number, because the mean of its divisors is an integer number (2552197324014).

Almost surely, 2^{21202120021023} is an apocalyptic number.

21202120021023 is a deficient number, since it is larger than the sum of its proper divisors (9424247867145).

21202120021023 is a wasteful number, since it uses less digits than its factorization.

21202120021023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83339494 (or 83339491 counting only the distinct ones).

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

Adding to 21202120021023 its reverse (32012002120212), we get a palindrome (53214122141235).

The spelling of 21202120021023 in words is "twenty-one trillion, two hundred two billion, one hundred twenty million, twenty-one thousand, twenty-three".