21020220110001 has 64 divisors (see below), whose sum is σ = 32298739200000. Its totient is φ = 11911412088576.

The previous prime is 21020220109997. The next prime is 21020220110039. The reversal of 21020220110001 is 10001102202012.

It is not a de Polignac number, because 21020220110001 - 2² = 21020220109997 is a prime.

It is a super-3 number, since 3×21020220110001³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21020220110501) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4204882500 + ... + 4204887498.

It is an arithmetic number, because the mean of its divisors is an integer number (504667800000).

Almost surely, 2^{21020220110001} is an apocalyptic number.

21020220110001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21020220110001 is a deficient number, since it is larger than the sum of its proper divisors (11278519089999).

21020220110001 is a wasteful number, since it uses less digits than its factorization.

21020220110001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7438.

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

Adding to 21020220110001 its reverse (10001102202012), we get a palindrome (31021322312013).

The spelling of 21020220110001 in words is "twenty-one trillion, twenty billion, two hundred twenty million, one hundred ten thousand, one".