21523035 has 16 divisors (see below), whose sum is σ = 35087904. Its totient is φ = 11261952.

The previous prime is 21523001. The next prime is 21523049. The reversal of 21523035 is 53032512.

It is not a de Polignac number, because 21523035 - 2⁶ = 21522971 is a prime.

It is a super-2 number, since 2×21523035² = 926482071222450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12742 + ... + 14331.

It is an arithmetic number, because the mean of its divisors is an integer number (2192994).

Almost surely, 2^21523035 is an apocalyptic number.

21523035 is a deficient number, since it is larger than the sum of its proper divisors (13564869).

21523035 is a wasteful number, since it uses less digits than its factorization.

21523035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27134.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 21523035 is about 4639.2925107176. The cubic root of 21523035 is about 278.1641586912.

Adding to 21523035 its reverse (53032512), we get a palindrome (74555547).

The spelling of 21523035 in words is "twenty-one million, five hundred twenty-three thousand, thirty-five".