21400412 has 24 divisors (see below), whose sum is σ = 41809152. Its totient is φ = 9500400.

The previous prime is 21400397. The next prime is 21400417.

21400412 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400417) 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, 3764 + ... + 7547.

It is an arithmetic number, because the mean of its divisors is an integer number (1742048).

Almost surely, 2^21400412 is an apocalyptic number.

21400412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21400412 is a deficient number, since it is larger than the sum of its proper divisors (20408740).

21400412 is a wasteful number, since it uses less digits than its factorization.

21400412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11369 (or 11367 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 21400412 is about 4626.0579330570. The cubic root of 21400412 is about 277.6348915385.

It can be divided in two parts, 21400 and 412, that added together give a palindrome (21812).

The spelling of 21400412 in words is "twenty-one million, four hundred thousand, four hundred twelve".