21154029 has 16 divisors (see below), whose sum is σ = 30510144. Its totient is φ = 12960000.

The previous prime is 21154027. The next prime is 21154039. The reversal of 21154029 is 92045112.

It is not a de Polignac number, because 21154029 - 2¹ = 21154027 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154027) 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, 8709 + ... + 10869.

It is an arithmetic number, because the mean of its divisors is an integer number (1906884).

Almost surely, 2^21154029 is an apocalyptic number.

It is an amenable number.

21154029 is a deficient number, since it is larger than the sum of its proper divisors (9356115).

21154029 is a wasteful number, since it uses less digits than its factorization.

21154029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2428.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 21154029 is about 4599.3509324686. The cubic root of 21154029 is about 276.5653058479.

The spelling of 21154029 in words is "twenty-one million, one hundred fifty-four thousand, twenty-nine".