221422712500021 has 4 divisors (see below), whose sum is σ = 221439086299872. Its totient is φ = 221406338700172.

The previous prime is 221422712499997. The next prime is 221422712500057. The reversal of 221422712500021 is 120005217224122.

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 221422712500021 - 2³⁷ = 221285273546549 is a prime.

It is a super-2 number, since 2×221422712500021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221422712800021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8186879641 + ... + 8186906686.

It is an arithmetic number, because the mean of its divisors is an integer number (55359771574968).

Almost surely, 2^{221422712500021} is an apocalyptic number.

It is an amenable number.

221422712500021 is a deficient number, since it is larger than the sum of its proper divisors (16373799851).

221422712500021 is a wasteful number, since it uses less digits than its factorization.

221422712500021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16373799850.

The product of its (nonzero) digits is 8960, while the sum is 31.

Adding to 221422712500021 its reverse (120005217224122), we get a palindrome (341427929724143).

The spelling of 221422712500021 in words is "two hundred twenty-one trillion, four hundred twenty-two billion, seven hundred twelve million, five hundred thousand, twenty-one".