21020220112001 has 4 divisors (see below), whose sum is σ = 22931149213104. Its totient is φ = 19109291010900.

The previous prime is 21020220111977. The next prime is 21020220112013. The reversal of 21020220112001 is 10021102202012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21020220112001 - 2⁶ = 21020220111937 is a prime.

It is a super-3 number, since 3×21020220112001³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21020220115001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 955464550535 + ... + 955464550556.

It is an arithmetic number, because the mean of its divisors is an integer number (5732787303276).

Almost surely, 2^{21020220112001} is an apocalyptic number.

It is an amenable number.

21020220112001 is a deficient number, since it is larger than the sum of its proper divisors (1910929101103).

21020220112001 is a wasteful number, since it uses less digits than its factorization.

21020220112001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1910929101102.

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

Adding to 21020220112001 its reverse (10021102202012), we get a palindrome (31041322314013).

The spelling of 21020220112001 in words is "twenty-one trillion, twenty billion, two hundred twenty million, one hundred twelve thousand, one".