101211112421 has 4 divisors (see below), whose sum is σ = 101244397644. Its totient is φ = 101177827200.

The previous prime is 101211112403. The next prime is 101211112441. The reversal of 101211112421 is 124211112101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124211112101 = 4057 ⋅30616493.

It can be written as a sum of positive squares in 2 ways, for example, as 70245671521 + 30965440900 = 265039^2 + 175970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101211112421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 101211112421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101211112441) 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, 16638050 + ... + 16644131.

It is an arithmetic number, because the mean of its divisors is an integer number (25311099411).

Almost surely, 2^101211112421 is an apocalyptic number.

It is an amenable number.

101211112421 is a deficient number, since it is larger than the sum of its proper divisors (33285223).

101211112421 is an equidigital number, since it uses as much as digits as its factorization.

101211112421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33285222.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 101211112421 its reverse (124211112101), we get a palindrome (225422224522).

The spelling of 101211112421 in words is "one hundred one billion, two hundred eleven million, one hundred twelve thousand, four hundred twenty-one".