21011154 has 16 divisors (see below), whose sum is σ = 42104448. Its totient is φ = 6990032.

The previous prime is 21011143. The next prime is 21011173. The reversal of 21011154 is 45111012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199 + ... + 6485.

It is an arithmetic number, because the mean of its divisors is an integer number (2631528).

Almost surely, 2^21011154 is an apocalyptic number.

21011154 is an abundant number, since it is smaller than the sum of its proper divisors (21093294).

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

21011154 is a wasteful number, since it uses less digits than its factorization.

21011154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6849.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 21011154 is about 4583.7925345722. The cubic root of 21011154 is about 275.9412550882.

Adding to 21011154 its reverse (45111012), we get a palindrome (66122166).

The spelling of 21011154 in words is "twenty-one million, eleven thousand, one hundred fifty-four".