21430157 has 16 divisors (see below), whose sum is σ = 26227200. Its totient is φ = 17100720.

The previous prime is 21430147. The next prime is 21430169. The reversal of 21430157 is 75103412.

It is not a de Polignac number, because 21430157 - 2⁸ = 21429901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21430117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6482 + ... + 9212.

It is an arithmetic number, because the mean of its divisors is an integer number (1639200).

Almost surely, 2^21430157 is an apocalyptic number.

It is an amenable number.

21430157 is a deficient number, since it is larger than the sum of its proper divisors (4797043).

21430157 is a wasteful number, since it uses less digits than its factorization.

21430157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2816.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 21430157 is about 4629.2717569829. The cubic root of 21430157 is about 277.7634626875.

Adding to 21430157 its reverse (75103412), we get a palindrome (96533569).

The spelling of 21430157 in words is "twenty-one million, four hundred thirty thousand, one hundred fifty-seven".