21025160 has 32 divisors (see below), whose sum is σ = 50946840. Its totient is φ = 7762944.

The previous prime is 21025157. The next prime is 21025163. The reversal of 21025160 is 6152012.

It is an interprime number because it is at equal distance from previous prime (21025157) and next prime (21025163).

It can be written as a sum of positive squares in 4 ways, for example, as 9012004 + 12013156 = 3002^2 + 3466^2 .

It is not an unprimeable number, because it can be changed into a prime (21025163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19697 + ... + 20736.

Almost surely, 2^21025160 is an apocalyptic number.

21025160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21025160 is an abundant number, since it is smaller than the sum of its proper divisors (29921680).

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

21025160 is a wasteful number, since it uses less digits than its factorization.

21025160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40457 (or 40453 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 21025160 is about 4585.3200542601. The cubic root of 21025160 is about 276.0025554619.

Adding to 21025160 its reverse (6152012), we get a palindrome (27177172).

The spelling of 21025160 in words is "twenty-one million, twenty-five thousand, one hundred sixty".