21019652 has 12 divisors (see below), whose sum is σ = 36852816. Its totient is φ = 10490280.

The previous prime is 21019651. The next prime is 21019657. The reversal of 21019652 is 25691012.

It is a super-2 number, since 2×21019652² = 883651540402208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21019651) 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, 2318 + ... + 6885.

It is an arithmetic number, because the mean of its divisors is an integer number (3071068).

Almost surely, 2^21019652 is an apocalyptic number.

It is an amenable number.

21019652 is a deficient number, since it is larger than the sum of its proper divisors (15833164).

21019652 is a wasteful number, since it uses less digits than its factorization.

21019652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9778 (or 9776 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 21019652 is about 4584.7194025371. The cubic root of 21019652 is about 275.9784517238.

The spelling of 21019652 in words is "twenty-one million, nineteen thousand, six hundred fifty-two".