1113210021 has 16 divisors (see below), whose sum is σ = 1850531328. Its totient is φ = 578290800.

The previous prime is 1113210017. The next prime is 1113210023. The reversal of 1113210021 is 1200123111.

It is not a de Polignac number, because 1113210021 - 2² = 1113210017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1113209979 and 1113210006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1113210023) 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, 2409315 + ... + 2409776.

It is an arithmetic number, because the mean of its divisors is an integer number (115658208).

Almost surely, 2^1113210021 is an apocalyptic number.

1113210021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1113210021 is a deficient number, since it is larger than the sum of its proper divisors (737321307).

1113210021 is a wasteful number, since it uses less digits than its factorization.

1113210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4819112.

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

The square root of 1113210021 is about 33364.8021273917. The cubic root of 1113210021 is about 1036.3959385249.

Adding to 1113210021 its reverse (1200123111), we get a palindrome (2313333132).

It can be divided in two parts, 11132100 and 21, that added together give a triangular number (11132121 = T₄₇₁₈).

The spelling of 1113210021 in words is "one billion, one hundred thirteen million, two hundred ten thousand, twenty-one".