21450136 has 8 divisors (see below), whose sum is σ = 40219020. Its totient is φ = 10725064.

The previous prime is 21450119. The next prime is 21450137. The reversal of 21450136 is 63105412.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1340626 + ... + 1340641.

Almost surely, 2^21450136 is an apocalyptic number.

It is an amenable number.

21450136 is a deficient number, since it is larger than the sum of its proper divisors (18768884).

21450136 is a wasteful number, since it uses less digits than its factorization.

21450136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2681273 (or 2681269 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 21450136 is about 4631.4291530801. The cubic root of 21450136 is about 277.8497540535.

Adding to 21450136 its reverse (63105412), we get a palindrome (84555548).

The spelling of 21450136 in words is "twenty-one million, four hundred fifty thousand, one hundred thirty-six".