21221012011012 has 48 divisors (see below), whose sum is σ = 40915164528000. Its totient is φ = 9550128896000.

The previous prime is 21221012010973. The next prime is 21221012011063. The reversal of 21221012011012 is 21011021012212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 253261668 + ... + 253345444.

It is an arithmetic number, because the mean of its divisors is an integer number (852399261000).

Almost surely, 2^{21221012011012} is an apocalyptic number.

21221012011012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21221012011012 is a deficient number, since it is larger than the sum of its proper divisors (19694152516988).

21221012011012 is a wasteful number, since it uses less digits than its factorization.

21221012011012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140892 (or 140890 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21221012011012 its reverse (21011021012212), we get a palindrome (42232033023224).

The spelling of 21221012011012 in words is "twenty-one trillion, two hundred twenty-one billion, twelve million, eleven thousand, twelve".