21001222012001 has 24 divisors (see below), whose sum is σ = 26995228341312. Its totient is φ = 15984016725600.

The previous prime is 21001222011983. The next prime is 21001222012009. The reversal of 21001222012001 is 10021022210012.

It is not a de Polignac number, because 21001222012001 - 2³⁸ = 20726344105057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001222012009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 288275570 + ... + 288348411.

It is an arithmetic number, because the mean of its divisors is an integer number (1124801180888).

Almost surely, 2^{21001222012001} is an apocalyptic number.

It is an amenable number.

21001222012001 is a deficient number, since it is larger than the sum of its proper divisors (5994006329311).

21001222012001 is a wasteful number, since it uses less digits than its factorization.

21001222012001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576624053 (or 576624042 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21001222012001 its reverse (10021022210012), we get a palindrome (31022244222013).

The spelling of 21001222012001 in words is "twenty-one trillion, one billion, two hundred twenty-two million, twelve thousand, one".