21221114012 has 24 divisors (see below), whose sum is σ = 42468501600. Its totient is φ = 9089133120.

The previous prime is 21221114009. The next prime is 21221114039. The reversal of 21221114012 is 21041112212.

It is a super-2 number, since 2×21221114012² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188387 + ... + 279162.

It is an arithmetic number, because the mean of its divisors is an integer number (1769520900).

Almost surely, 2^21221114012 is an apocalyptic number.

It is an amenable number.

21221114012 is an abundant number, since it is smaller than the sum of its proper divisors (21247387588).

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

21221114012 is a wasteful number, since it uses less digits than its factorization.

21221114012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469181 (or 469179 counting only the distinct ones).

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

Adding to 21221114012 its reverse (21041112212), we get a palindrome (42262226224).

The spelling of 21221114012 in words is "twenty-one billion, two hundred twenty-one million, one hundred fourteen thousand, twelve".