21002022010123 has 32 divisors (see below), whose sum is σ = 27733128012288. Its totient is φ = 15397811520000.

The previous prime is 21002022010049. The next prime is 21002022010141. The reversal of 21002022010123 is 32101022020012.

It is a happy number.

It is not a de Polignac number, because 21002022010123 - 2²¹ = 21002019912971 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21002022010097 and 21002022010106.

It is not an unprimeable number, because it can be changed into a prime (21002022011123) 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, 1787961 + ... + 6723157.

It is an arithmetic number, because the mean of its divisors is an integer number (866660250384).

Almost surely, 2^{21002022010123} is an apocalyptic number.

21002022010123 is a deficient number, since it is larger than the sum of its proper divisors (6731106002165).

21002022010123 is a wasteful number, since it uses less digits than its factorization.

21002022010123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4938483.

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

Adding to 21002022010123 its reverse (32101022020012), we get a palindrome (53103044030135).

The spelling of 21002022010123 in words is "twenty-one trillion, two billion, twenty-two million, ten thousand, one hundred twenty-three".