212120201031123 has 64 divisors (see below), whose sum is σ = 357185293516800. Its totient is φ = 108765051557760.

The previous prime is 212120201031121. The next prime is 212120201031127. The reversal of 212120201031123 is 321130102021212.

It is not a de Polignac number, because 212120201031123 - 2¹ = 212120201031121 is a prime.

It is a super-2 number, since 2×212120201031123² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 212120201031123.

It is not an unprimeable number, because it can be changed into a prime (212120201031121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 59568165 + ... + 63028617.

It is an arithmetic number, because the mean of its divisors is an integer number (5581020211200).

Almost surely, 2^{212120201031123} is an apocalyptic number.

212120201031123 is a deficient number, since it is larger than the sum of its proper divisors (145065092485677).

212120201031123 is a wasteful number, since it uses less digits than its factorization.

212120201031123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3463912.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 212120201031123 its reverse (321130102021212), we get a palindrome (533250303052335).

The spelling of 212120201031123 in words is "two hundred twelve trillion, one hundred twenty billion, two hundred one million, thirty-one thousand, one hundred twenty-three".