21001201012 has 48 divisors (see below), whose sum is σ = 40553017344. Its totient is φ = 9437148000.

The previous prime is 21001200991. The next prime is 21001201127. The reversal of 21001201012 is 21010210012.

It is a self number, because there is not a number n which added to its sum of digits gives 21001201012.

It is a congruent number.

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, 1362187 + ... + 1377517.

It is an arithmetic number, because the mean of its divisors is an integer number (844854528).

Almost surely, 2^21001201012 is an apocalyptic number.

21001201012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21001201012 is a deficient number, since it is larger than the sum of its proper divisors (19551816332).

21001201012 is a wasteful number, since it uses less digits than its factorization.

21001201012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15700 (or 15698 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21001201012 its reverse (21010210012), we get a palindrome (42011411024).

The spelling of 21001201012 in words is "twenty-one billion, one million, two hundred one thousand, twelve".