21235690308 has 48 divisors (see below), whose sum is σ = 58455240704. Its totient is φ = 5871618720.

The previous prime is 21235690303. The next prime is 21235690337. The reversal of 21235690308 is 80309653212.

It is not an unprimeable number, because it can be changed into a prime (21235690303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4074910 + ... + 4080117.

Almost surely, 2^21235690308 is an apocalyptic number.

21235690308 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21235690308 is an abundant number, since it is smaller than the sum of its proper divisors (37219550396).

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

21235690308 is a wasteful number, since it uses less digits than its factorization.

21235690308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8155072 (or 8155070 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The spelling of 21235690308 in words is "twenty-one billion, two hundred thirty-five million, six hundred ninety thousand, three hundred eight".