21002202001001 has 4 divisors (see below), whose sum is σ = 22617756001092. Its totient is φ = 19386648000912.

The previous prime is 21002202000943. The next prime is 21002202001037. The reversal of 21002202001001 is 10010020220012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11763939619600 + 9238262381401 = 3429860^2 + 3039451^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21002202001001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002202001801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 807777000026 + ... + 807777000051.

It is an arithmetic number, because the mean of its divisors is an integer number (5654439000273).

Almost surely, 2^{21002202001001} is an apocalyptic number.

It is an amenable number.

21002202001001 is a deficient number, since it is larger than the sum of its proper divisors (1615554000091).

21002202001001 is a wasteful number, since it uses less digits than its factorization.

21002202001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615554000090.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21002202001001 its reverse (10010020220012), we get a palindrome (31012222221013).

The spelling of 21002202001001 in words is "twenty-one trillion, two billion, two hundred two million, one thousand, one".