1231021101 has 8 divisors (see below), whose sum is σ = 1642445280. Its totient is φ = 820138832.

The previous prime is 1231021093. The next prime is 1231021109. The reversal of 1231021101 is 1011201321.

It is an interprime number because it is at equal distance from previous prime (1231021093) and next prime (1231021109).

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

It is a cyclic number.

It is not a de Polignac number, because 1231021101 - 2³ = 1231021093 is a prime.

It is a super-2 number, since 2×1231021101² = 3030825902214504402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231021109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130146 + ... + 139283.

It is an arithmetic number, because the mean of its divisors is an integer number (205305660).

Almost surely, 2^1231021101 is an apocalyptic number.

It is an amenable number.

1231021101 is a deficient number, since it is larger than the sum of its proper divisors (411424179).

1231021101 is a wasteful number, since it uses less digits than its factorization.

1231021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270955.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 1231021101 is about 35085.9102917396. The cubic root of 1231021101 is about 1071.7376781311.

Adding to 1231021101 its reverse (1011201321), we get a palindrome (2242222422).

It can be divided in two parts, 12310 and 21101, that added together give a triangular number (33411 = T₂₅₈).

The spelling of 1231021101 in words is "one billion, two hundred thirty-one million, twenty-one thousand, one hundred one".