21435215630 has 32 divisors (see below), whose sum is σ = 39078093600. Its totient is φ = 8464310272.

The previous prime is 21435215573. The next prime is 21435215647. The reversal of 21435215630 is 3651253412.

It is a happy number.

It is a super-4 number, since 4×21435215630⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

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, 1160306 + ... + 1178634.

It is an arithmetic number, because the mean of its divisors is an integer number (1221190425).

Almost surely, 2^21435215630 is an apocalyptic number.

21435215630 is a deficient number, since it is larger than the sum of its proper divisors (17642877970).

21435215630 is a wasteful number, since it uses less digits than its factorization.

21435215630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19828.

The product of its (nonzero) digits is 21600, while the sum is 32.

The spelling of 21435215630 in words is "twenty-one billion, four hundred thirty-five million, two hundred fifteen thousand, six hundred thirty".