21122214 has 16 divisors (see below), whose sum is σ = 42385728. Its totient is φ = 7017192.

The previous prime is 21122203. The next prime is 21122221. The reversal of 21122214 is 41222112.

It is a super-2 number, since 2×21122214² = 892295848523592, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21122193 and 21122202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3892 + ... + 7575.

It is an arithmetic number, because the mean of its divisors is an integer number (2649108).

Almost surely, 2^21122214 is an apocalyptic number.

21122214 is an abundant number, since it is smaller than the sum of its proper divisors (21263514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21122214 is a wasteful number, since it uses less digits than its factorization.

21122214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11779.

The product of its digits is 64, while the sum is 15.

The square root of 21122214 is about 4595.8909908743. The cubic root of 21122214 is about 276.4265877500.

Adding to 21122214 its reverse (41222112), we get a palindrome (62344326).

The spelling of 21122214 in words is "twenty-one million, one hundred twenty-two thousand, two hundred fourteen".