21455000532212 has 48 divisors (see below), whose sum is σ = 43205698887120. Its totient is φ = 9234316265472.

The previous prime is 21455000532083. The next prime is 21455000532271. The reversal of 21455000532212 is 21223500055412.

It can be written as a sum of positive squares in 8 ways, for example, as 261812328976 + 21193188203236 = 511676^2 + 4603606^2 .

It is a super-2 number, since 2×21455000532212² (a number of 27 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 in 15 ways as a sum of consecutive naturals, for example, 111235583 + ... + 111428294.

It is an arithmetic number, because the mean of its divisors is an integer number (900118726815).

Almost surely, 2^{21455000532212} is an apocalyptic number.

It is an amenable number.

21455000532212 is an abundant number, since it is smaller than the sum of its proper divisors (21750698354908).

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

21455000532212 is a wasteful number, since it uses less digits than its factorization.

21455000532212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222664020 (or 222664018 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 21455000532212 its reverse (21223500055412), we get a palindrome (42678500587624).

The spelling of 21455000532212 in words is "twenty-one trillion, four hundred fifty-five billion, five hundred thirty-two thousand, two hundred twelve".