1211223001031 has 8 divisors (see below), whose sum is σ = 1231513228704. Its totient is φ = 1190946777120.

The previous prime is 1211223000997. The next prime is 1211223001091. The reversal of 1211223001031 is 1301003221121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211223001031 is a prime.

It is a super-2 number, since 2×1211223001031² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211223001091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3326435 + ... + 3672548.

It is an arithmetic number, because the mean of its divisors is an integer number (153939153588).

Almost surely, 2^{1211223001031} is an apocalyptic number.

1211223001031 is a deficient number, since it is larger than the sum of its proper divisors (20290227673).

1211223001031 is an equidigital number, since it uses as much as digits as its factorization.

1211223001031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7001881.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 1211223001031 its reverse (1301003221121), we get a palindrome (2512226222152).

The spelling of 1211223001031 in words is "one trillion, two hundred eleven billion, two hundred twenty-three million, one thousand, thirty-one".