21001022001201 has 16 divisors (see below), whose sum is σ = 30547017696960. Its totient is φ = 12727860203520.

The previous prime is 21001022001133. The next prime is 21001022001269. The reversal of 21001022001201 is 10210022010012.

It is an interprime number because it is at equal distance from previous prime (21001022001133) and next prime (21001022001269).

It is not a de Polignac number, because 21001022001201 - 2⁹ = 21001022000689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001022003201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25309561 + ... + 26126153.

It is an arithmetic number, because the mean of its divisors is an integer number (1909188606060).

Almost surely, 2^{21001022001201} is an apocalyptic number.

It is an amenable number.

21001022001201 is a deficient number, since it is larger than the sum of its proper divisors (9545995695759).

21001022001201 is a wasteful number, since it uses less digits than its factorization.

21001022001201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1595936.

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

Adding to 21001022001201 its reverse (10210022010012), we get a palindrome (31211044011213).

The spelling of 21001022001201 in words is "twenty-one trillion, one billion, twenty-two million, one thousand, two hundred one".