21001011220101 has 32 divisors (see below), whose sum is σ = 30703107456000. Its totient is φ = 12662820910080.

The previous prime is 21001011220099. The next prime is 21001011220139. The reversal of 21001011220101 is 10102211010012.

It is not a de Polignac number, because 21001011220101 - 2¹ = 21001011220099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001011220801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78466830 + ... + 78734016.

It is an arithmetic number, because the mean of its divisors is an integer number (959472108000).

Almost surely, 2^{21001011220101} is an apocalyptic number.

It is an amenable number.

21001011220101 is a deficient number, since it is larger than the sum of its proper divisors (9702096235899).

21001011220101 is a wasteful number, since it uses less digits than its factorization.

21001011220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279369.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21001011220101 its reverse (10102211010012), we get a palindrome (31103222230113).

The spelling of 21001011220101 in words is "twenty-one trillion, one billion, eleven million, two hundred twenty thousand, one hundred one".