21154068 has 144 divisors (see below), whose sum is σ = 63537600. Its totient is φ = 6065280.

The previous prime is 21154039. The next prime is 21154097. The reversal of 21154068 is 86045112.

It is an interprime number because it is at equal distance from previous prime (21154039) and next prime (21154097).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 346758 + ... + 346818.

Almost surely, 2^21154068 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21154068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31768800).

21154068 is an abundant number, since it is smaller than the sum of its proper divisors (42383532).

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

21154068 is a wasteful number, since it uses less digits than its factorization.

21154068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 21154068 is about 4599.3551721953. The cubic root of 21154068 is about 276.5654758083.

The spelling of 21154068 in words is "twenty-one million, one hundred fifty-four thousand, sixty-eight".