21011001220012 has 24 divisors (see below), whose sum is σ = 38951625384000. Its totient is φ = 9882583683840.

The previous prime is 21011001219997. The next prime is 21011001220049. The reversal of 21011001220012 is 21002210011012.

It is a junction number, because it is equal to n+sod(n) for n = 21011001219974 and 21011001220001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77149039 + ... + 77420902.

It is an arithmetic number, because the mean of its divisors is an integer number (1622984391000).

Almost surely, 2^{21011001220012} is an apocalyptic number.

It is an amenable number.

21011001220012 is a deficient number, since it is larger than the sum of its proper divisors (17940624163988).

21011001220012 is a wasteful number, since it uses less digits than its factorization.

21011001220012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154571961 (or 154571959 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21011001220012 its reverse (21002210011012), we get a palindrome (42013211231024).

The spelling of 21011001220012 in words is "twenty-one trillion, eleven billion, one million, two hundred twenty thousand, twelve".