21212071700 has 36 divisors (see below), whose sum is σ = 46049448480. Its totient is φ = 8481279840.

The previous prime is 21212071669. The next prime is 21212071729. The reversal of 21212071700 is 717021212.

It is a super-3 number, since 3×21212071700³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 202769 + ... + 289031.

Almost surely, 2^21212071700 is an apocalyptic number.

21212071700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212071700 is an abundant number, since it is smaller than the sum of its proper divisors (24837376780).

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

21212071700 is a wasteful number, since it uses less digits than its factorization.

21212071700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88736 (or 88729 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 23.

Adding to 21212071700 its reverse (717021212), we get a palindrome (21929092912).

The spelling of 21212071700 in words is "twenty-one billion, two hundred twelve million, seventy-one thousand, seven hundred".