1211023121031 has 12 divisors (see below), whose sum is σ = 1766574983160. Its totient is φ = 799355194800.

The previous prime is 1211023121029. The next prime is 1211023121041. The reversal of 1211023121031 is 1301213201121.

It is not a de Polignac number, because 1211023121031 - 2¹ = 1211023121029 is a prime.

It is a super-2 number, since 2×1211023121031² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211023120995 and 1211023121013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211023121041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 666128421 + ... + 666130238.

It is an arithmetic number, because the mean of its divisors is an integer number (147214581930).

Almost surely, 2^{1211023121031} is an apocalyptic number.

1211023121031 is a deficient number, since it is larger than the sum of its proper divisors (555551862129).

1211023121031 is a wasteful number, since it uses less digits than its factorization.

1211023121031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332258766 (or 1332258763 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 1211023121031 its reverse (1301213201121), we get a palindrome (2512236322152).

The spelling of 1211023121031 in words is "one trillion, two hundred eleven billion, twenty-three million, one hundred twenty-one thousand, thirty-one".