21011214 has 32 divisors (see below), whose sum is σ = 48936960. Its totient is φ = 5889312.

The previous prime is 21011191. The next prime is 21011231. The reversal of 21011214 is 41211012.

It is a happy number.

It is a super-2 number, since 2×21011214² = 882942227507592, 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 21011214.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2494 + ... + 6945.

It is an arithmetic number, because the mean of its divisors is an integer number (1529280).

Almost surely, 2^21011214 is an apocalyptic number.

21011214 is an abundant number, since it is smaller than the sum of its proper divisors (27925746).

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

21011214 is a wasteful number, since it uses less digits than its factorization.

21011214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9504.

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

The square root of 21011214 is about 4583.7990793664. The cubic root of 21011214 is about 275.9415177497.

Adding to 21011214 its reverse (41211012), we get a palindrome (62222226).

The spelling of 21011214 in words is "twenty-one million, eleven thousand, two hundred fourteen".