221641036751401 has 4 divisors (see below), whose sum is σ = 221651719812432. Its totient is φ = 221630353690372.

The previous prime is 221641036751369. The next prime is 221641036751411. The reversal of 221641036751401 is 104157630146122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221641036751401 - 2⁵ = 221641036751369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221641036751411) 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, 5341499395 + ... + 5341540888.

It is an arithmetic number, because the mean of its divisors is an integer number (55412929953108).

Almost surely, 2^{221641036751401} is an apocalyptic number.

It is an amenable number.

221641036751401 is a deficient number, since it is larger than the sum of its proper divisors (10683061031).

221641036751401 is a wasteful number, since it uses less digits than its factorization.

221641036751401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10683061030.

The product of its (nonzero) digits is 241920, while the sum is 43.

Adding to 221641036751401 its reverse (104157630146122), we get a palindrome (325798666897523).

The spelling of 221641036751401 in words is "two hundred twenty-one trillion, six hundred forty-one billion, thirty-six million, seven hundred fifty-one thousand, four hundred one".