21154011 has 16 divisors (see below), whose sum is σ = 29927040. Its totient is φ = 13253760.

The previous prime is 21153971. The next prime is 21154019. The reversal of 21154011 is 11045112.

It is a happy number.

It is not a de Polignac number, because 21154011 - 2⁶ = 21153947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21154019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6051 + ... + 8883.

It is an arithmetic number, because the mean of its divisors is an integer number (1870440).

Almost surely, 2^21154011 is an apocalyptic number.

21154011 is a deficient number, since it is larger than the sum of its proper divisors (8773029).

21154011 is a wasteful number, since it uses less digits than its factorization.

21154011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2986.

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

The square root of 21154011 is about 4599.3489756704. The cubic root of 21154011 is about 276.5652274046.

Adding to 21154011 its reverse (11045112), we get a palindrome (32199123).

The spelling of 21154011 in words is "twenty-one million, one hundred fifty-four thousand, eleven".