21534203606 has 16 divisors (see below), whose sum is σ = 33716844000. Its totient is φ = 10295564928.

The previous prime is 21534203543. The next prime is 21534203623. The reversal of 21534203606 is 60630243512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66320 + ... + 217868.

It is an arithmetic number, because the mean of its divisors is an integer number (2107302750).

Almost surely, 2^21534203606 is an apocalyptic number.

21534203606 is a deficient number, since it is larger than the sum of its proper divisors (12182640394).

21534203606 is a wasteful number, since it uses less digits than its factorization.

21534203606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154663.

The product of its (nonzero) digits is 25920, while the sum is 32.

The spelling of 21534203606 in words is "twenty-one billion, five hundred thirty-four million, two hundred three thousand, six hundred six".