20210221101 has 16 divisors (see below), whose sum is σ = 30800384000. Its totient is φ = 11547251568.

The previous prime is 20210221079. The next prime is 20210221123. The reversal of 20210221101 is 10112201202.

It is an interprime number because it is at equal distance from previous prime (20210221079) and next prime (20210221123).

It is not a de Polignac number, because 20210221101 - 2⁵ = 20210221069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210221001) 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, 124620 + ... + 236538.

It is an arithmetic number, because the mean of its divisors is an integer number (1925024000).

Almost surely, 2^20210221101 is an apocalyptic number.

20210221101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20210221101 is a deficient number, since it is larger than the sum of its proper divisors (10590162899).

20210221101 is a wasteful number, since it uses less digits than its factorization.

20210221101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120528.

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

Adding to 20210221101 its reverse (10112201202), we get a palindrome (30322422303).

The spelling of 20210221101 in words is "twenty billion, two hundred ten million, two hundred twenty-one thousand, one hundred one".