1211121023 has 16 divisors (see below), whose sum is σ = 1409415744. Its totient is φ = 1019208960.

The previous prime is 1211121013. The next prime is 1211121029. The reversal of 1211121023 is 3201211121.

It is not a de Polignac number, because 1211121023 - 2⁸ = 1211120767 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211120989 and 1211121007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211121029) 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, 261161 + ... + 265757.

It is an arithmetic number, because the mean of its divisors is an integer number (88088484).

Almost surely, 2^1211121023 is an apocalyptic number.

1211121023 is a deficient number, since it is larger than the sum of its proper divisors (198294721).

1211121023 is an equidigital number, since it uses as much as digits as its factorization.

1211121023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5282.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1211121023 is about 34801.1641040928. The cubic root of 1211121023 is about 1065.9312163530.

Adding to 1211121023 its reverse (3201211121), we get a palindrome (4412332144).

The spelling of 1211121023 in words is "one billion, two hundred eleven million, one hundred twenty-one thousand, twenty-three".