211220020121101 has 4 divisors (see below), whose sum is σ = 211220056543804. Its totient is φ = 211219983698400.

The previous prime is 211220020121087. The next prime is 211220020121107. The reversal of 211220020121101 is 101121020022112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 201905627422500 + 9314392698601 = 14209350^2 + 3051949^2 .

It is a cyclic number.

It is not a de Polignac number, because 211220020121101 - 2⁵ = 211220020121069 is a prime.

It is a super-2 number, since 2×211220020121101² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220020121107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7355640 + ... + 21829921.

It is an arithmetic number, because the mean of its divisors is an integer number (52805014135951).

Almost surely, 2^{211220020121101} is an apocalyptic number.

It is an amenable number.

211220020121101 is a deficient number, since it is larger than the sum of its proper divisors (36422703).

211220020121101 is an equidigital number, since it uses as much as digits as its factorization.

211220020121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36422702.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 211220020121101 its reverse (101121020022112), we get a palindrome (312341040143213).

The spelling of 211220020121101 in words is "two hundred eleven trillion, two hundred twenty billion, twenty million, one hundred twenty-one thousand, one hundred one".