21621271331034 has 48 divisors (see below), whose sum is σ = 46897346505672. Its totient is φ = 7199205830784.

The previous prime is 21621271330993. The next prime is 21621271331083. The reversal of 21621271331034 is 43013317212612.

21621271331034 is a `hidden beast` number, since 2 + 1 + 6 + 21 + 271 + 331 + 0 + 34 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 17077531455009 + 4543739876025 = 4132497^2 + 2131605^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21621271331034.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 221997172 + ... + 222094544.

Almost surely, 2^{21621271331034} is an apocalyptic number.

21621271331034 is an abundant number, since it is smaller than the sum of its proper divisors (25276075174638).

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

21621271331034 is a wasteful number, since it uses less digits than its factorization.

21621271331034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110751 (or 110748 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

Adding to 21621271331034 its reverse (43013317212612), we get a palindrome (64634588543646).

It can be divided in two parts, 2162127 and 1331034, that added together give a square (3493161 = 1869²).

The spelling of 21621271331034 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred seventy-one million, three hundred thirty-one thousand, thirty-four".