21698000216 has 32 divisors (see below), whose sum is σ = 42254427600. Its totient is φ = 10433136000.

The previous prime is 21698000173. The next prime is 21698000231. The reversal of 21698000216 is 61200089612.

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, 128075 + ... + 244538.

Almost surely, 2^21698000216 is an apocalyptic number.

It is an amenable number.

21698000216 is a deficient number, since it is larger than the sum of its proper divisors (20556427384).

21698000216 is a wasteful number, since it uses less digits than its factorization.

21698000216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372899 (or 372895 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

Adding to 21698000216 its reverse (61200089612), we get a palindrome (82898089828).

The spelling of 21698000216 in words is "twenty-one billion, six hundred ninety-eight million, two hundred sixteen", and thus it is an aban number.