21457035 has 16 divisors (see below), whose sum is σ = 38146080. Its totient is φ = 11443680.

The previous prime is 21457027. The next prime is 21457049. The reversal of 21457035 is 53075412.

It is a happy number.

It is not a de Polignac number, because 21457035 - 2³ = 21457027 is a prime.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79336 + ... + 79605.

It is an arithmetic number, because the mean of its divisors is an integer number (2384130).

Almost surely, 2^21457035 is an apocalyptic number.

21457035 is a deficient number, since it is larger than the sum of its proper divisors (16689045).

21457035 is a wasteful number, since it uses less digits than its factorization.

21457035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158955 (or 158949 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 21457035 is about 4632.1738956995. The cubic root of 21457035 is about 277.8795391013.

It can be divided in two parts, 2145 and 7035, that added together give a triangular number (9180 = T₁₃₅).

The spelling of 21457035 in words is "twenty-one million, four hundred fifty-seven thousand, thirty-five".