101023920421 has 2 divisors, whose sum is σ = 101023920422. Its totient is φ = 101023920420.

The previous prime is 101023920397. The next prime is 101023920479. The reversal of 101023920421 is 124029320101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76264897921 + 24759022500 = 276161^2 + 157350^2 .

It is an emirp because it is prime and its reverse (124029320101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 101023920421 - 2⁷ = 101023920293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101023920521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50511960210 + 50511960211.

It is an arithmetic number, because the mean of its divisors is an integer number (50511960211).

Almost surely, 2^101023920421 is an apocalyptic number.

It is an amenable number.

101023920421 is a deficient number, since it is larger than the sum of its proper divisors (1).

101023920421 is an equidigital number, since it uses as much as digits as its factorization.

101023920421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 101023920421 in words is "one hundred one billion, twenty-three million, nine hundred twenty thousand, four hundred twenty-one".