21121413 has 8 divisors (see below), whose sum is σ = 28923168. Its totient is φ = 13700304.

The previous prime is 21121411. The next prime is 21121417. The reversal of 21121413 is 31412112.

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

It is not a de Polignac number, because 21121413 - 2¹ = 21121411 is a prime.

It is a super-2 number, since 2×21121413² = 892228174233138, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121392 and 21121401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95031 + ... + 95252.

It is an arithmetic number, because the mean of its divisors is an integer number (3615396).

Almost surely, 2^21121413 is an apocalyptic number.

It is an amenable number.

21121413 is a deficient number, since it is larger than the sum of its proper divisors (7801755).

21121413 is a wasteful number, since it uses less digits than its factorization.

21121413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190323.

The product of its digits is 48, while the sum is 15.

The square root of 21121413 is about 4595.8038469891. The cubic root of 21121413 is about 276.4230934746.

Adding to 21121413 its reverse (31412112), we get a palindrome (52533525).

The spelling of 21121413 in words is "twenty-one million, one hundred twenty-one thousand, four hundred thirteen".