21030702 has 64 divisors (see below), whose sum is σ = 53568000. Its totient is φ = 5456640.

The previous prime is 21030677. The next prime is 21030703. The reversal of 21030702 is 20703012.

It is a super-2 number, since 2×21030702² = 884580853225608, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030703) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22174 + ... + 23102.

It is an arithmetic number, because the mean of its divisors is an integer number (837000).

Almost surely, 2^21030702 is an apocalyptic number.

21030702 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21030702, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26784000).

21030702 is an abundant number, since it is smaller than the sum of its proper divisors (32537298).

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

21030702 is a wasteful number, since it uses less digits than its factorization.

21030702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966 (or 952 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 15.

The square root of 21030702 is about 4585.9243343082. The cubic root of 21030702 is about 276.0268037401.

Adding to 21030702 its reverse (20703012), we get a palindrome (41733714).

The spelling of 21030702 in words is "twenty-one million, thirty thousand, seven hundred two".