21201012121002 has 64 divisors (see below), whose sum is σ = 49160973496320. Its totient is φ = 5970017716416.

The previous prime is 21201012121001. The next prime is 21201012121013. The reversal of 21201012121002 is 20012121010212.

It is not an unprimeable number, because it can be changed into a prime (21201012121001) 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, 3887688 + ... + 7583939.

It is an arithmetic number, because the mean of its divisors is an integer number (768140210880).

Almost surely, 2^{21201012121002} is an apocalyptic number.

21201012121002 is an abundant number, since it is smaller than the sum of its proper divisors (27959961375318).

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

21201012121002 is a wasteful number, since it uses less digits than its factorization.

21201012121002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11472275.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21201012121002 its reverse (20012121010212), we get a palindrome (41213133131214).

The spelling of 21201012121002 in words is "twenty-one trillion, two hundred one billion, twelve million, one hundred twenty-one thousand, two".