20102101 has 4 divisors (see below), whose sum is σ = 20177100. Its totient is φ = 20027104.

The previous prime is 20102099. The next prime is 20102111. The reversal of 20102101 is 10120102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10120102 = 2 ⋅5060051.

It can be written as a sum of positive squares in 2 ways, for example, as 4301476 + 15800625 = 2074^2 + 3975^2 .

It is a cyclic number.

It is not a de Polignac number, because 20102101 - 2¹ = 20102099 is a prime.

It is a super-2 number, since 2×20102101² = 808188929228402, which 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 (20102111) 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, 37096 + ... + 37633.

It is an arithmetic number, because the mean of its divisors is an integer number (5044275).

Almost surely, 2^20102101 is an apocalyptic number.

It is an amenable number.

20102101 is a deficient number, since it is larger than the sum of its proper divisors (74999).

20102101 is an equidigital number, since it uses as much as digits as its factorization.

20102101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74998.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 20102101 is about 4483.5366620560. The cubic root of 20102101 is about 271.9028857820.

Adding to 20102101 its reverse (10120102), we get a palindrome (30222203).

It can be divided in two parts, 20102 and 101, that multiplied together give a palindrome (2030302).

The spelling of 20102101 in words is "twenty million, one hundred two thousand, one hundred one".