21013154 has 8 divisors (see below), whose sum is σ = 32252880. Its totient is φ = 10262196.

The previous prime is 21013127. The next prime is 21013159. The reversal of 21013154 is 45131012.

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 (21013159) 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, 122084 + ... + 122255.

It is an arithmetic number, because the mean of its divisors is an integer number (4031610).

Almost surely, 2^21013154 is an apocalyptic number.

21013154 is a deficient number, since it is larger than the sum of its proper divisors (11239726).

21013154 is a wasteful number, since it uses less digits than its factorization.

21013154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244384.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 21013154 is about 4584.0106893418. The cubic root of 21013154 is about 275.9500101999.

Adding to 21013154 its reverse (45131012), we get a palindrome (66144166).

The spelling of 21013154 in words is "twenty-one million, thirteen thousand, one hundred fifty-four".