21158270 has 16 divisors (see below), whose sum is σ = 43525728. Its totient is φ = 7254240.

The previous prime is 21158261. The next prime is 21158273. The reversal of 21158270 is 7285112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21158273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151061 + ... + 151200.

It is an arithmetic number, because the mean of its divisors is an integer number (2720358).

Almost surely, 2^21158270 is an apocalyptic number.

21158270 is an abundant number, since it is smaller than the sum of its proper divisors (22367458).

21158270 is a wasteful number, since it uses less digits than its factorization.

21158270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302275.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 21158270 is about 4599.8119526781. The cubic root of 21158270 is about 276.5837867259.

The spelling of 21158270 in words is "twenty-one million, one hundred fifty-eight thousand, two hundred seventy".