21439035 has 12 divisors (see below), whose sum is σ = 37161072. Its totient is φ = 11434128.

The previous prime is 21438961. The next prime is 21439079. The reversal of 21439035 is 53093412.

It is not a de Polignac number, because 21439035 - 2⁸ = 21438779 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 238167 + ... + 238256.

It is an arithmetic number, because the mean of its divisors is an integer number (3096756).

Almost surely, 2^21439035 is an apocalyptic number.

21439035 is a deficient number, since it is larger than the sum of its proper divisors (15722037).

21439035 is a wasteful number, since it uses less digits than its factorization.

21439035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476434 (or 476431 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 21439035 is about 4630.2305558147. The cubic root of 21439035 is about 277.8018143052.

The spelling of 21439035 in words is "twenty-one million, four hundred thirty-nine thousand, thirty-five".