21012221200004 has 6 divisors (see below), whose sum is σ = 36771387100014. Its totient is φ = 10506110600000.

The previous prime is 21012221199979. The next prime is 21012221200021. The reversal of 21012221200004 is 40000212221012.

It can be written as a sum of positive squares in only one way, i.e., 16549860695104 + 4462360504900 = 4068152^2 + 2112430^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2626527649997 + ... + 2626527650004.

It is an arithmetic number, because the mean of its divisors is an integer number (6128564516669).

Almost surely, 2^{21012221200004} is an apocalyptic number.

It is an amenable number.

21012221200004 is a deficient number, since it is larger than the sum of its proper divisors (15759165900010).

21012221200004 is a wasteful number, since it uses less digits than its factorization.

21012221200004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5253055300005 (or 5253055300003 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21012221200004 its reverse (40000212221012), we get a palindrome (61012433421016).

The spelling of 21012221200004 in words is "twenty-one trillion, twelve billion, two hundred twenty-one million, two hundred thousand, four".