21001001022201 has 16 divisors (see below), whose sum is σ = 28597282608384. Its totient is φ = 13702697034624.

The previous prime is 21001001022193. The next prime is 21001001022229. The reversal of 21001001022201 is 10222010010012.

It is not a de Polignac number, because 21001001022201 - 2³ = 21001001022193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001001032201) 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, 29788491 + ... + 30485343.

It is an arithmetic number, because the mean of its divisors is an integer number (1787330163024).

Almost surely, 2^{21001001022201} is an apocalyptic number.

It is an amenable number.

21001001022201 is a deficient number, since it is larger than the sum of its proper divisors (7596281586183).

21001001022201 is a wasteful number, since it uses less digits than its factorization.

21001001022201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910640.

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

Adding to 21001001022201 its reverse (10222010010012), we get a palindrome (31223011032213).

The spelling of 21001001022201 in words is "twenty-one trillion, one billion, one million, twenty-two thousand, two hundred one".