21513035 has 8 divisors (see below), whose sum is σ = 27174480. Its totient is φ = 16304544.

The previous prime is 21513031. The next prime is 21513049. The reversal of 21513035 is 53031512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21513035 - 2² = 21513031 is a prime.

It is a super-2 number, since 2×21513035² = 925621349822450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21512998 and 21513016.

It is not an unprimeable number, because it can be changed into a prime (21513031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113132 + ... + 113321.

It is an arithmetic number, because the mean of its divisors is an integer number (3396810).

Almost surely, 2^21513035 is an apocalyptic number.

21513035 is a deficient number, since it is larger than the sum of its proper divisors (5661445).

21513035 is a wasteful number, since it uses less digits than its factorization.

21513035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226477.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 21513035 is about 4638.2146349646. The cubic root of 21513035 is about 278.1210719472.

Adding to 21513035 its reverse (53031512), we get a palindrome (74544547).

The spelling of 21513035 in words is "twenty-one million, five hundred thirteen thousand, thirty-five".