221402055001 has 4 divisors (see below), whose sum is σ = 221403055104. Its totient is φ = 221401054900.

The previous prime is 221402054941. The next prime is 221402055019. The reversal of 221402055001 is 100550204122.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 221402055001 - 2³¹ = 219254571353 is a prime.

It is a super-2 number, since 2×221402055001² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221402055401) 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, 3865 + ... + 665446.

It is an arithmetic number, because the mean of its divisors is an integer number (55350763776).

Almost surely, 2^221402055001 is an apocalyptic number.

It is an amenable number.

221402055001 is a deficient number, since it is larger than the sum of its proper divisors (1000103).

221402055001 is an equidigital number, since it uses as much as digits as its factorization.

221402055001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000102.

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 221402055001 its reverse (100550204122), we get a palindrome (321952259123).

The spelling of 221402055001 in words is "two hundred twenty-one billion, four hundred two million, fifty-five thousand, one".