21001220022112 has 48 divisors (see below), whose sum is σ = 45675841075200. Its totient is φ = 9425173530240.

The previous prime is 21001220022103. The next prime is 21001220022131. The reversal of 21001220022112 is 21122002210012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 377583312 + ... + 377638927.

It is an arithmetic number, because the mean of its divisors is an integer number (951580022400).

Almost surely, 2^{21001220022112} is an apocalyptic number.

21001220022112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21001220022112 is an abundant number, since it is smaller than the sum of its proper divisors (24674621053088).

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

21001220022112 is a wasteful number, since it uses less digits than its factorization.

21001220022112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755222339 (or 755222331 counting only the distinct ones).

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

Adding to 21001220022112 its reverse (21122002210012), we get a palindrome (42123222232124).

The spelling of 21001220022112 in words is "twenty-one trillion, one billion, two hundred twenty million, twenty-two thousand, one hundred twelve".