103631621021 has 4 divisors (see below), whose sum is σ = 103634534652. Its totient is φ = 103628707392.

The previous prime is 103631621011. The next prime is 103631621059. The reversal of 103631621021 is 120126136301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120126136301 = 83 ⋅1447302847.

It can be written as a sum of positive squares in 2 ways, for example, as 47637864121 + 55993756900 = 218261^2 + 236630^2 .

It is a cyclic number.

It is not a de Polignac number, because 103631621021 - 2⁶ = 103631620957 is a prime.

It is a super-3 number, since 3×103631621021³ (a number of 34 digits) contains 333 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 (103631621011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1402796 + ... + 1474821.

It is an arithmetic number, because the mean of its divisors is an integer number (25908633663).

Almost surely, 2^103631621021 is an apocalyptic number.

It is an amenable number.

103631621021 is a deficient number, since it is larger than the sum of its proper divisors (2913631).

103631621021 is an equidigital number, since it uses as much as digits as its factorization.

103631621021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2913630.

The product of its (nonzero) digits is 1296, while the sum is 26.

Adding to 103631621021 its reverse (120126136301), we get a palindrome (223757757322).

The spelling of 103631621021 in words is "one hundred three billion, six hundred thirty-one million, six hundred twenty-one thousand, twenty-one".