1211123140021 has 16 divisors (see below), whose sum is σ = 1362741690240. Its totient is φ = 1070725582080.

The previous prime is 1211123139991. The next prime is 1211123140081. The reversal of 1211123140021 is 1200413211121.

It is a cyclic number.

It is not a de Polignac number, because 1211123140021 - 2⁹ = 1211123139509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211123140081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33780240 + ... + 33816073.

It is an arithmetic number, because the mean of its divisors is an integer number (85171355640).

Almost surely, 2^{1211123140021} is an apocalyptic number.

It is an amenable number.

1211123140021 is a deficient number, since it is larger than the sum of its proper divisors (151618550219).

1211123140021 is a wasteful number, since it uses less digits than its factorization.

1211123140021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67596396.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 1211123140021 its reverse (1200413211121), we get a palindrome (2411536351142).

The spelling of 1211123140021 in words is "one trillion, two hundred eleven billion, one hundred twenty-three million, one hundred forty thousand, twenty-one".