21362661222012 has 144 divisors (see below), whose sum is σ = 58989487939200. Its totient is φ = 6464712247680.

The previous prime is 21362661221963. The next prime is 21362661222013. The reversal of 21362661222012 is 21022216626312.

21362661222012 is a `hidden beast` number, since 2 + 1 + 3 + 6 + 2 + 6 + 612 + 2 + 20 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21362661222013) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 950750314 + ... + 950772782.

It is an arithmetic number, because the mean of its divisors is an integer number (409649221800).

Almost surely, 2^{21362661222012} is an apocalyptic number.

21362661222012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21362661222012 is an abundant number, since it is smaller than the sum of its proper divisors (37626826717188).

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

21362661222012 is a wasteful number, since it uses less digits than its factorization.

21362661222012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25656 (or 25651 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

Adding to 21362661222012 its reverse (21022216626312), we get a palindrome (42384877848324).

The spelling of 21362661222012 in words is "twenty-one trillion, three hundred sixty-two billion, six hundred sixty-one million, two hundred twenty-two thousand, twelve".