21052062 has 32 divisors (see below), whose sum is σ = 47369760. Its totient is φ = 7015896.

The previous prime is 21052051. The next prime is 21052063. The reversal of 21052062 is 26025012.

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 (21052063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1968 + ... + 6780.

It is an arithmetic number, because the mean of its divisors is an integer number (1480305).

Almost surely, 2^21052062 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21052062, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23684880).

21052062 is an abundant number, since it is smaller than the sum of its proper divisors (26317698).

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

21052062 is an frugal number, since it uses more digits than its factorization.

21052062 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4836 (or 4818 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21052062 is about 4588.2526085646. The cubic root of 21052062 is about 276.1202217276.

Adding to 21052062 its reverse (26025012), we get a palindrome (47077074).

The spelling of 21052062 in words is "twenty-one million, fifty-two thousand, sixty-two".