21211200121012 has 96 divisors (see below), whose sum is σ = 42832246504320. Its totient is φ = 9102017003520.

The previous prime is 21211200120911. The next prime is 21211200121019. The reversal of 21211200121012 is 21012100211212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211200121019) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9240708 + ... + 11305444.

It is an arithmetic number, because the mean of its divisors is an integer number (446169234420).

Almost surely, 2^{21211200121012} is an apocalyptic number.

21211200121012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21211200121012 is an abundant number, since it is smaller than the sum of its proper divisors (21621046383308).

21211200121012 is a wasteful number, since it uses less digits than its factorization.

21211200121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2064961 (or 2064959 counting only the distinct ones).

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

Adding to 21211200121012 its reverse (21012100211212), we get a palindrome (42223300332224).

The spelling of 21211200121012 in words is "twenty-one trillion, two hundred eleven billion, two hundred million, one hundred twenty-one thousand, twelve".