101012040421 has 2 divisors, whose sum is σ = 101012040422. Its totient is φ = 101012040420.

The previous prime is 101012040397. The next prime is 101012040443. The reversal of 101012040421 is 124040210101.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100473150625 + 538889796 = 316975^2 + 23214^2 .

It is an emirp because it is prime and its reverse (124040210101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 101012040421 - 2²³ = 101003651813 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 101012040395 and 101012040404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101012040221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50506020210 + 50506020211.

It is an arithmetic number, because the mean of its divisors is an integer number (50506020211).

Almost surely, 2^101012040421 is an apocalyptic number.

It is an amenable number.

101012040421 is a deficient number, since it is larger than the sum of its proper divisors (1).

101012040421 is an equidigital number, since it uses as much as digits as its factorization.

101012040421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 101012040421 its reverse (124040210101), we get a palindrome (225052250522).

The spelling of 101012040421 in words is "one hundred one billion, twelve million, forty thousand, four hundred twenty-one".