21011022002001 has 32 divisors (see below), whose sum is σ = 29126493527040. Its totient is φ = 13456475364416.

The previous prime is 21011022001999. The next prime is 21011022002077. The reversal of 21011022002001 is 10020022011012.

It is a cyclic number.

It is not a de Polignac number, because 21011022002001 - 2¹ = 21011022001999 is a prime.

It is a super-2 number, since 2×21011022002001² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21011022002501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13353100 + ... + 14843426.

It is an arithmetic number, because the mean of its divisors is an integer number (910202922720).

Almost surely, 2^{21011022002001} is an apocalyptic number.

It is an amenable number.

21011022002001 is a deficient number, since it is larger than the sum of its proper divisors (8115471525039).

21011022002001 is a wasteful number, since it uses less digits than its factorization.

21011022002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1491173.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21011022002001 its reverse (10020022011012), we get a palindrome (31031044013013).

The spelling of 21011022002001 in words is "twenty-one trillion, eleven billion, twenty-two million, two thousand, one".