101213220421 has 4 divisors (see below), whose sum is σ = 104703331500. Its totient is φ = 97723109344.

The previous prime is 101213220397. The next prime is 101213220463. The reversal of 101213220421 is 124022312101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31735641025 + 69477579396 = 178145^2 + 263586^2 .

It is a cyclic number.

It is not a de Polignac number, because 101213220421 - 2²¹ = 101211123269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101213220481) 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, 1745055496 + ... + 1745055553.

It is an arithmetic number, because the mean of its divisors is an integer number (26175832875).

Almost surely, 2^101213220421 is an apocalyptic number.

It is an amenable number.

101213220421 is a deficient number, since it is larger than the sum of its proper divisors (3490111079).

101213220421 is an equidigital number, since it uses as much as digits as its factorization.

101213220421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3490111078.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 101213220421 its reverse (124022312101), we get a palindrome (225235532522).

The spelling of 101213220421 in words is "one hundred one billion, two hundred thirteen million, two hundred twenty thousand, four hundred twenty-one".