21020160 has 320 divisors, whose sum is σ = 84851712. Its totient is φ = 4325376.

The previous prime is 21020159. The next prime is 21020161. The reversal of 21020160 is 6102012.

It is an interprime number because it is at equal distance from previous prime (21020159) and next prime (21020161).

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020161) 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, 913909 + ... + 913931.

Almost surely, 2^21020160 is an apocalyptic number.

21020160 is a gapful number since it is divisible by the number (20) 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 21020160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42425856).

21020160 is an abundant number, since it is smaller than the sum of its proper divisors (63831552).

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

21020160 is a wasteful number, since it uses less digits than its factorization.

21020160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 21020160 is about 4584.7748036299. The cubic root of 21020160 is about 275.9806749754.

Adding to 21020160 its reverse (6102012), we get a palindrome (27122172).

The spelling of 21020160 in words is "twenty-one million, twenty thousand, one hundred sixty".