21150154 has 8 divisors (see below), whose sum is σ = 33395040. Its totient is φ = 10018476.

The previous prime is 21150139. The next prime is 21150163. The reversal of 21150154 is 45105112.

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

It is a Harshad number since it is a multiple of its sum of digits (19).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278254 + ... + 278329.

It is an arithmetic number, because the mean of its divisors is an integer number (4174380).

Almost surely, 2^21150154 is an apocalyptic number.

21150154 is a deficient number, since it is larger than the sum of its proper divisors (12244886).

21150154 is a wasteful number, since it uses less digits than its factorization.

21150154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556604.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 21150154 is about 4598.9296580835. The cubic root of 21150154 is about 276.5484177174.

Adding to 21150154 its reverse (45105112), we get a palindrome (66255266).

The spelling of 21150154 in words is "twenty-one million, one hundred fifty thousand, one hundred fifty-four".