21101214 has 16 divisors (see below), whose sum is σ = 43100928. Its totient is φ = 6883992.

The previous prime is 21101209. The next prime is 21101219. The reversal of 21101214 is 41210112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21101209) and next prime (21101219).

It is a super-2 number, since 2×21101214² = 890522464547592, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21101214.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101219) 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, 37132 + ... + 37695.

It is an arithmetic number, because the mean of its divisors is an integer number (2693808).

Almost surely, 2^21101214 is an apocalyptic number.

21101214 is an abundant number, since it is smaller than the sum of its proper divisors (21999714).

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

21101214 is a wasteful number, since it uses less digits than its factorization.

21101214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74879.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 21101214 is about 4593.6057732461. The cubic root of 21101214 is about 276.3349483161.

Adding to 21101214 its reverse (41210112), we get a palindrome (62311326).

The spelling of 21101214 in words is "twenty-one million, one hundred one thousand, two hundred fourteen".