21533313112 has 8 divisors (see below), whose sum is σ = 40374962100. Its totient is φ = 10766656552.

The previous prime is 21533313107. The next prime is 21533313163. The reversal of 21533313112 is 21131333512.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21533313112² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1345832062 + ... + 1345832077.

Almost surely, 2^21533313112 is an apocalyptic number.

It is an amenable number.

21533313112 is a deficient number, since it is larger than the sum of its proper divisors (18841648988).

21533313112 is a wasteful number, since it uses less digits than its factorization.

21533313112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2691664145 (or 2691664141 counting only the distinct ones).

The product of its digits is 1620, while the sum is 25.

Adding to 21533313112 its reverse (21131333512), we get a palindrome (42664646624).

The spelling of 21533313112 in words is "twenty-one billion, five hundred thirty-three million, three hundred thirteen thousand, one hundred twelve".