21019152 has 160 divisors (see below), whose sum is σ = 69709824. Its totient is φ = 5343360.

The previous prime is 21019151. The next prime is 21019177. The reversal of 21019152 is 25191012.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21019151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 447193 + ... + 447239.

Almost surely, 2^21019152 is an apocalyptic number.

21019152 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21019152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34854912).

21019152 is an abundant number, since it is smaller than the sum of its proper divisors (48690672).

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

21019152 is a wasteful number, since it uses less digits than its factorization.

21019152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 70 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 21019152 is about 4584.6648732486. The cubic root of 21019152 is about 275.9762634491.

The spelling of 21019152 in words is "twenty-one million, nineteen thousand, one hundred fifty-two".