1311021023213 has 16 divisors (see below), whose sum is σ = 1465240637952. Its totient is φ = 1162889208000.

The previous prime is 1311021023209. The next prime is 1311021023233. The reversal of 1311021023213 is 3123201201131.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1311021023213 - 2² = 1311021023209 is a prime.

It is a super-2 number, since 2×1311021023213² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311021023233) 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, 6106493 + ... + 6317538.

It is an arithmetic number, because the mean of its divisors is an integer number (91577539872).

Almost surely, 2^{1311021023213} is an apocalyptic number.

It is an amenable number.

1311021023213 is a deficient number, since it is larger than the sum of its proper divisors (154219614739).

1311021023213 is a wasteful number, since it uses less digits than its factorization.

1311021023213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12424276.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1311021023213 its reverse (3123201201131), we get a palindrome (4434222224344).

The spelling of 1311021023213 in words is "one trillion, three hundred eleven billion, twenty-one million, twenty-three thousand, two hundred thirteen".