21121414 has 4 divisors (see below), whose sum is σ = 31682124. Its totient is φ = 10560706.

The previous prime is 21121411. The next prime is 21121417. The reversal of 21121414 is 41412112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21121411) and next prime (21121417).

It is a super-2 number, since 2×21121414² = 892228258718792, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 5280352 + ... + 5280355.

It is an arithmetic number, because the mean of its divisors is an integer number (7920531).

Almost surely, 2^21121414 is an apocalyptic number.

21121414 is a deficient number, since it is larger than the sum of its proper divisors (10560710).

21121414 is a wasteful number, since it uses less digits than its factorization.

21121414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10560709.

The product of its digits is 64, while the sum is 16.

The square root of 21121414 is about 4595.8039557840. The cubic root of 21121414 is about 276.4230978371.

Adding to 21121414 its reverse (41412112), we get a palindrome (62533526).

The spelling of 21121414 in words is "twenty-one million, one hundred twenty-one thousand, four hundred fourteen".