1211320023 has 16 divisors (see below), whose sum is σ = 1756320480. Its totient is φ = 739501056.

The previous prime is 1211320007. The next prime is 1211320027. The reversal of 1211320023 is 3200231121.

It is not a de Polignac number, because 1211320023 - 2⁴ = 1211320007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211319984 and 1211320011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211320027) 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, 319078 + ... + 322851.

It is an arithmetic number, because the mean of its divisors is an integer number (109770030).

Almost surely, 2^1211320023 is an apocalyptic number.

1211320023 is a deficient number, since it is larger than the sum of its proper divisors (545000457).

1211320023 is a wasteful number, since it uses less digits than its factorization.

1211320023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641986.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1211320023 is about 34804.0230864192. The cubic root of 1211320023 is about 1065.9895944152.

Adding to 1211320023 its reverse (3200231121), we get a palindrome (4411551144).

The spelling of 1211320023 in words is "one billion, two hundred eleven million, three hundred twenty thousand, twenty-three".