21743335988 has 48 divisors (see below), whose sum is σ = 45023827968. Its totient is φ = 9075072000.

The previous prime is 21743335987. The next prime is 21743335993. The reversal of 21743335988 is 88953334712.

It is a happy number.

It is a super-2 number, since 2×21743335988² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21743335987) 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, 323828 + ... + 385163.

It is an arithmetic number, because the mean of its divisors is an integer number (937996416).

Almost surely, 2^21743335988 is an apocalyptic number.

It is an amenable number.

21743335988 is an abundant number, since it is smaller than the sum of its proper divisors (23280491980).

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

21743335988 is a wasteful number, since it uses less digits than its factorization.

21743335988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709064 (or 709062 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 53.

The spelling of 21743335988 in words is "twenty-one billion, seven hundred forty-three million, three hundred thirty-five thousand, nine hundred eighty-eight".