21401412 has 24 divisors (see below), whose sum is σ = 50128512. Its totient is φ = 7106400.

The previous prime is 21401407. The next prime is 21401417. The reversal of 21401412 is 21410412.

It is an interprime number because it is at equal distance from previous prime (21401407) and next prime (21401417).

It is a junction number, because it is equal to n+sod(n) for n = 21401391 and 21401400.

It is not an unprimeable number, because it can be changed into a prime (21401417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39 + ... + 6542.

It is an arithmetic number, because the mean of its divisors is an integer number (2088688).

Almost surely, 2^21401412 is an apocalyptic number.

It is an amenable number.

21401412 is an abundant number, since it is smaller than the sum of its proper divisors (28727100).

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

21401412 is a wasteful number, since it uses less digits than its factorization.

21401412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6859 (or 6857 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 21401412 is about 4626.1660151793. The cubic root of 21401412 is about 277.6392159189.

Adding to 21401412 its reverse (21410412), we get a palindrome (42811824).

The spelling of 21401412 in words is "twenty-one million, four hundred one thousand, four hundred twelve".