21535002 has 24 divisors (see below), whose sum is σ = 47745984. Its totient is φ = 7011144.

The previous prime is 21535001. The next prime is 21535027. The reversal of 21535002 is 20053512.

It is a happy number.

It is a super-2 number, since 2×21535002² = 927512622280008, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21535001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13138 + ... + 14685.

It is an arithmetic number, because the mean of its divisors is an integer number (1989416).

Almost surely, 2^21535002 is an apocalyptic number.

21535002 is an abundant number, since it is smaller than the sum of its proper divisors (26210982).

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

21535002 is a wasteful number, since it uses less digits than its factorization.

21535002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27874 (or 27871 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 21535002 is about 4640.5820755591. The cubic root of 21535002 is about 278.2157030596.

Adding to 21535002 its reverse (20053512), we get a palindrome (41588514).

The spelling of 21535002 in words is "twenty-one million, five hundred thirty-five thousand, two".