21516767082 has 24 divisors (see below), whose sum is σ = 47258290404. Its totient is φ = 7074005184.

The previous prime is 21516767081. The next prime is 21516767131. The reversal of 21516767082 is 28076761512.

It can be written as a sum of positive squares in 2 ways, for example, as 18572510961 + 2944256121 = 136281^2 + 54261^2 .

It is a super-2 number, since 2×21516767082² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21516767081) 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, 8186193 + ... + 8188820.

Almost surely, 2^21516767082 is an apocalyptic number.

21516767082 is an abundant number, since it is smaller than the sum of its proper divisors (25741523322).

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

21516767082 is a wasteful number, since it uses less digits than its factorization.

21516767082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16375094 (or 16375091 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The spelling of 21516767082 in words is "twenty-one billion, five hundred sixteen million, seven hundred sixty-seven thousand, eighty-two".