21401060 has 24 divisors (see below), whose sum is σ = 45359160. Its totient is φ = 8481024.

The previous prime is 21401053. The next prime is 21401069. The reversal of 21401060 is 6010412.

It can be written as a sum of positive squares in 4 ways, for example, as 10484644 + 10916416 = 3238^2 + 3304^2 .

It is not an unprimeable number, because it can be changed into a prime (21401069) 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, 2729 + ... + 7088.

It is an arithmetic number, because the mean of its divisors is an integer number (1889965).

Almost surely, 2^21401060 is an apocalyptic number.

21401060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21401060 is an abundant number, since it is smaller than the sum of its proper divisors (23958100).

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

21401060 is a wasteful number, since it uses less digits than its factorization.

21401060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9935 (or 9933 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21401060 is about 4626.1279705603. The cubic root of 21401060 is about 277.6376937523.

Adding to 21401060 its reverse (6010412), we get a palindrome (27411472).

The spelling of 21401060 in words is "twenty-one million, four hundred one thousand, sixty".