21123312600126 has 48 divisors (see below), whose sum is σ = 46438377728400. Its totient is φ = 6400727498880.

The previous prime is 21123312600067. The next prime is 21123312600149. The reversal of 21123312600126 is 62100621332112.

It is a junction number, because it is equal to n+sod(n) for n = 21123312600093 and 21123312600102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16523940 + ... + 17756328.

It is an arithmetic number, because the mean of its divisors is an integer number (967466202675).

Almost surely, 2^{21123312600126} is an apocalyptic number.

21123312600126 is an abundant number, since it is smaller than the sum of its proper divisors (25315065128274).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21123312600126 is a wasteful number, since it uses less digits than its factorization.

21123312600126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256025 (or 1256014 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

Adding to 21123312600126 its reverse (62100621332112), we get a palindrome (83223933932238).

The spelling of 21123312600126 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred twelve million, six hundred thousand, one hundred twenty-six".