21012023101323 has 16 divisors (see below), whose sum is σ = 28305170518016. Its totient is φ = 13863448753920.

The previous prime is 21012023101297. The next prime is 21012023101403. The reversal of 21012023101323 is 32310132021012.

It is not a de Polignac number, because 21012023101323 - 2²¹ = 21012021004171 is a prime.

It is a super-2 number, since 2×21012023101323² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21012023101323.

It is not an unprimeable number, because it can be changed into a prime (21012023101723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29690490 + ... + 30389952.

It is an arithmetic number, because the mean of its divisors is an integer number (1769073157376).

Almost surely, 2^{21012023101323} is an apocalyptic number.

21012023101323 is a deficient number, since it is larger than the sum of its proper divisors (7293147416693).

21012023101323 is a wasteful number, since it uses less digits than its factorization.

21012023101323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802794.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21012023101323 its reverse (32310132021012), we get a palindrome (53322155122335).

The spelling of 21012023101323 in words is "twenty-one trillion, twelve billion, twenty-three million, one hundred one thousand, three hundred twenty-three".