113211021 has 48 divisors (see below), whose sum is σ = 195317568. Its totient is φ = 57657600.

The previous prime is 113211019. The next prime is 113211023. The reversal of 113211021 is 120112311.

It is an interprime number because it is at equal distance from previous prime (113211019) and next prime (113211023).

It is not a de Polignac number, because 113211021 - 2¹ = 113211019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 113210988 and 113211006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113211023) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 85041 + ... + 86361.

It is an arithmetic number, because the mean of its divisors is an integer number (4069116).

Almost surely, 2^113211021 is an apocalyptic number.

113211021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

113211021 is a deficient number, since it is larger than the sum of its proper divisors (82106547).

113211021 is a wasteful number, since it uses less digits than its factorization.

113211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402 (or 1395 counting only the distinct ones).

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

The square root of 113211021 is about 10640.0667761062. The cubic root of 113211021 is about 483.7595694146.

Adding to 113211021 its reverse (120112311), we get a palindrome (233323332).

The spelling of 113211021 in words is "one hundred thirteen million, two hundred eleven thousand, twenty-one".