1021212120123 has 36 divisors (see below), whose sum is σ = 1607858873712. Its totient is φ = 624276244800.

The previous prime is 1021212120109. The next prime is 1021212120143. The reversal of 1021212120123 is 3210212121201.

It is not a de Polignac number, because 1021212120123 - 2⁴ = 1021212120107 is a prime.

It is a super-2 number, since 2×1021212120123² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1021212120096 and 1021212120105.

It is not an unprimeable number, because it can be changed into a prime (1021212120143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1993536 + ... + 2452877.

It is an arithmetic number, because the mean of its divisors is an integer number (44662746492).

Almost surely, 2^{1021212120123} is an apocalyptic number.

1021212120123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1021212120123 is a deficient number, since it is larger than the sum of its proper divisors (586646753589).

1021212120123 is a wasteful number, since it uses less digits than its factorization.

1021212120123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4446596 (or 4446580 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 1021212120123 its reverse (3210212121201), we get a palindrome (4231424241324).

The spelling of 1021212120123 in words is "one trillion, twenty-one billion, two hundred twelve million, one hundred twenty thousand, one hundred twenty-three".