21220120112012 has 24 divisors (see below), whose sum is σ = 39110257910640. Its totient is φ = 10046348222400.

The previous prime is 21220120111973. The next prime is 21220120112017. The reversal of 21220120112012 is 21021102102212.

It is not an unprimeable number, because it can be changed into a prime (21220120112017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73293743 + ... + 73582694.

It is an arithmetic number, because the mean of its divisors is an integer number (1629594079610).

Almost surely, 2^{21220120112012} is an apocalyptic number.

It is an amenable number.

21220120112012 is a deficient number, since it is larger than the sum of its proper divisors (17890137798628).

21220120112012 is a wasteful number, since it uses less digits than its factorization.

21220120112012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146878361 (or 146878359 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21220120112012 its reverse (21021102102212), we get a palindrome (42241222214224).

The spelling of 21220120112012 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty million, one hundred twelve thousand, twelve".