21020123112104 has 32 divisors (see below), whose sum is σ = 39804920202600. Its totient is φ = 10405954191360.

The previous prime is 21020123112101. The next prime is 21020123112143. The reversal of 21020123112104 is 40121132102012.

It can be written as a sum of positive squares in 4 ways, for example, as 11459646744100 + 9560476368004 = 3385210^2 + 3092002^2 .

It is a super-3 number, since 3×21020123112104³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21020123112101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29426009 + ... + 30131880.

Almost surely, 2^{21020123112104} is an apocalyptic number.

It is an amenable number.

21020123112104 is a deficient number, since it is larger than the sum of its proper divisors (18784797090496).

21020123112104 is a wasteful number, since it uses less digits than its factorization.

21020123112104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59558333 (or 59558329 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21020123112104 its reverse (40121132102012), we get a palindrome (61141255214116).

The spelling of 21020123112104 in words is "twenty-one trillion, twenty billion, one hundred twenty-three million, one hundred twelve thousand, one hundred four".