21353154 has 16 divisors (see below), whose sum is σ = 44563392. Its totient is φ = 6808208.

The previous prime is 21353153. The next prime is 21353159. The reversal of 21353154 is 45135312.

It is not an unprimeable number, because it can be changed into a prime (21353153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77229 + ... + 77504.

It is an arithmetic number, because the mean of its divisors is an integer number (2785212).

Almost surely, 2^21353154 is an apocalyptic number.

21353154 is an abundant number, since it is smaller than the sum of its proper divisors (23210238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21353154 is a wasteful number, since it uses less digits than its factorization.

21353154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154761.

The product of its digits is 1800, while the sum is 24.

The square root of 21353154 is about 4620.9473054775. The cubic root of 21353154 is about 277.4303761700.

Adding to 21353154 its reverse (45135312), we get a palindrome (66488466).

The spelling of 21353154 in words is "twenty-one million, three hundred fifty-three thousand, one hundred fifty-four".