21355154 has 8 divisors (see below), whose sum is σ = 32052540. Its totient is φ = 10670976.

The previous prime is 21355151. The next prime is 21355163. The reversal of 21355154 is 45155312.

It can be written as a sum of positive squares in 2 ways, for example, as 21022225 + 332929 = 4585^2 + 577^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21355151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3782 + ... + 7550.

Almost surely, 2^21355154 is an apocalyptic number.

21355154 is a deficient number, since it is larger than the sum of its proper divisors (10697386).

21355154 is a wasteful number, since it uses less digits than its factorization.

21355154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6604.

The product of its digits is 3000, while the sum is 26.

The square root of 21355154 is about 4621.1637062541. The cubic root of 21355154 is about 277.4390375513.

The spelling of 21355154 in words is "twenty-one million, three hundred fifty-five thousand, one hundred fifty-four".