21121332342212 has 12 divisors (see below), whose sum is σ = 36962553997740. Its totient is φ = 10560602628576.

The previous prime is 21121332342163. The next prime is 21121332342241. The reversal of 21121332342212 is 21224323312112.

It can be written as a sum of positive squares in 2 ways, for example, as 6947357294656 + 14173975047556 = 2635784^2 + 3764834^2 .

It is a super-2 number, since 2×21121332342212² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15133787 + ... + 16470402.

It is an arithmetic number, because the mean of its divisors is an integer number (3080212833145).

Almost surely, 2^{21121332342212} is an apocalyptic number.

It is an amenable number.

21121332342212 is a deficient number, since it is larger than the sum of its proper divisors (15841221655528).

21121332342212 is a wasteful number, since it uses less digits than its factorization.

21121332342212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31771270 (or 31771268 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

Adding to 21121332342212 its reverse (21224323312112), we get a palindrome (42345655654324).

The spelling of 21121332342212 in words is "twenty-one trillion, one hundred twenty-one billion, three hundred thirty-two million, three hundred forty-two thousand, two hundred twelve".