21861414 has 20 divisors (see below), whose sum is σ = 48986124. Its totient is φ = 7287084.

The previous prime is 21861409. The next prime is 21861443. The reversal of 21861414 is 41416812.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 67312 + ... + 67635.

Almost surely, 2^21861414 is an apocalyptic number.

21861414 is an abundant number, since it is smaller than the sum of its proper divisors (27124710).

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

21861414 is a wasteful number, since it uses less digits than its factorization.

21861414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134961 (or 134952 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 21861414 is about 4675.6191033915. The cubic root of 21861414 is about 279.6143244517.

It can be divided in two parts, 2186 and 1414, that added together give a square (3600 = 60²).

The spelling of 21861414 in words is "twenty-one million, eight hundred sixty-one thousand, four hundred fourteen".