21014136 has 144 divisors (see below), whose sum is σ = 67658760. Its totient is φ = 5840640.

The previous prime is 21014131. The next prime is 21014167. The reversal of 21014136 is 63141012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21014131) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 133770 + ... + 133926.

Almost surely, 2^21014136 is an apocalyptic number.

21014136 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21014136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33829380).

21014136 is an abundant number, since it is smaller than the sum of its proper divisors (46644624).

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

21014136 is a wasteful number, since it uses less digits than its factorization.

21014136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 186 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21014136 is about 4584.1177995335. The cubic root of 21014136 is about 275.9543087564.

Adding to 21014136 its reverse (63141012), we get a palindrome (84155148).

The spelling of 21014136 in words is "twenty-one million, fourteen thousand, one hundred thirty-six".