21014406 has 24 divisors (see below), whose sum is σ = 52035984. Its totient is φ = 6004080.

The previous prime is 21014381. The next prime is 21014407. The reversal of 21014406 is 60441012.

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 (21014407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83265 + ... + 83516.

It is an arithmetic number, because the mean of its divisors is an integer number (2168166).

Almost surely, 2^21014406 is an apocalyptic number.

21014406 is an abundant number, since it is smaller than the sum of its proper divisors (31021578).

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

21014406 is a wasteful number, since it uses less digits than its factorization.

21014406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166796 (or 166793 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 21014406 is about 4584.1472489439. The cubic root of 21014406 is about 275.9554906171.

Adding to 21014406 its reverse (60441012), we get a palindrome (81455418).

The spelling of 21014406 in words is "twenty-one million, fourteen thousand, four hundred six".