21141456 has 40 divisors (see below), whose sum is σ = 62418624. Its totient is φ = 6040320.

The previous prime is 21141451. The next prime is 21141481. The reversal of 21141456 is 65414112.

It is a happy number.

It is a super-2 number, since 2×21141456² = 893922323599872, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21141451) 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, 31125 + ... + 31796.

Almost surely, 2^21141456 is an apocalyptic number.

It is an amenable number.

21141456 is an abundant number, since it is smaller than the sum of its proper divisors (41277168).

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

21141456 is a wasteful number, since it uses less digits than its factorization.

21141456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62939 (or 62933 counting only the distinct ones).

The product of its digits is 960, while the sum is 24.

The square root of 21141456 is about 4597.9839060179. The cubic root of 21141456 is about 276.5105023441.

Adding to 21141456 its reverse (65414112), we get a palindrome (86555568).

It can be divided in two parts, 2114 and 1456, that added together give a triangular number (3570 = T₈₄).

The spelling of 21141456 in words is "twenty-one million, one hundred forty-one thousand, four hundred fifty-six".