21712611700 has 36 divisors (see below), whose sum is σ = 50740706380. Its totient is φ = 8016963840.

The previous prime is 21712611671. The next prime is 21712611709. The reversal of 21712611700 is 711621712.

It can be written as a sum of positive squares in 6 ways, for example, as 3924521316 + 17788090384 = 62646^2 + 133372^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21712611709) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8349705 + ... + 8352304.

Almost surely, 2^21712611700 is an apocalyptic number.

21712611700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21712611700 is an abundant number, since it is smaller than the sum of its proper divisors (29028094680).

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

21712611700 is a wasteful number, since it uses less digits than its factorization.

21712611700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16702036 (or 16702029 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 28.

It can be divided in two parts, 217126 and 11700, that added together give a triangular number (228826 = T₆₇₆).

The spelling of 21712611700 in words is "twenty-one billion, seven hundred twelve million, six hundred eleven thousand, seven hundred".