1211112021123 has 12 divisors (see below), whose sum is σ = 1809707618160. Its totient is φ = 779566358256.

The previous prime is 1211112021121. The next prime is 1211112021143. The reversal of 1211112021123 is 3211202111121.

It is a happy number.

It is not a de Polignac number, because 1211112021123 - 2¹ = 1211112021121 is a prime.

It is a super-2 number, since 2×1211112021123² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211112021096 and 1211112021105.

It is not an unprimeable number, because it can be changed into a prime (1211112021121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2320137711 + ... + 2320138232.

It is an arithmetic number, because the mean of its divisors is an integer number (150808968180).

Almost surely, 2^{1211112021123} is an apocalyptic number.

1211112021123 is a deficient number, since it is larger than the sum of its proper divisors (598595597037).

1211112021123 is a wasteful number, since it uses less digits than its factorization.

1211112021123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4640275978 (or 4640275975 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 1211112021123 its reverse (3211202111121), we get a palindrome (4422314132244).

The spelling of 1211112021123 in words is "one trillion, two hundred eleven billion, one hundred twelve million, twenty-one thousand, one hundred twenty-three".