21070113 has 4 divisors (see below), whose sum is σ = 28093488. Its totient is φ = 14046740.

The previous prime is 21070103. The next prime is 21070117. The reversal of 21070113 is 31107012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21070113 - 2⁵ = 21070081 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21070092 and 21070101.

It is not an unprimeable number, because it can be changed into a prime (21070117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3511683 + ... + 3511688.

It is an arithmetic number, because the mean of its divisors is an integer number (7023372).

Almost surely, 2^21070113 is an apocalyptic number.

It is an amenable number.

21070113 is a deficient number, since it is larger than the sum of its proper divisors (7023375).

21070113 is an equidigital number, since it uses as much as digits as its factorization.

21070113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7023374.

The product of its (nonzero) digits is 42, while the sum is 15.

The square root of 21070113 is about 4590.2192758081. The cubic root of 21070113 is about 276.1991185474.

Adding to 21070113 its reverse (31107012), we get a palindrome (52177125).

The spelling of 21070113 in words is "twenty-one million, seventy thousand, one hundred thirteen".