21200120012212 has 12 divisors (see below), whose sum is σ = 37428530464836. Its totient is φ = 10506254165120.

The previous prime is 21200120012117. The next prime is 21200120012221. The reversal of 21200120012212 is 21221002100212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11866826170276 + 9333293841936 = 3444826^2 + 3055044^2 .

It is a congruent number.

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, 23451459739 + ... + 23451460642.

It is an arithmetic number, because the mean of its divisors is an integer number (3119044205403).

Almost surely, 2^{21200120012212} is an apocalyptic number.

It is an amenable number.

21200120012212 is a deficient number, since it is larger than the sum of its proper divisors (16228410452624).

21200120012212 is a wasteful number, since it uses less digits than its factorization.

21200120012212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46902920498 (or 46902920496 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21200120012212 its reverse (21221002100212), we get a palindrome (42421122112424).

The spelling of 21200120012212 in words is "twenty-one trillion, two hundred billion, one hundred twenty million, twelve thousand, two hundred twelve".