221213141112451 has 4 divisors (see below), whose sum is σ = 228349048890304. Its totient is φ = 214077233334600.

The previous prime is 221213141112233. The next prime is 221213141112461. The reversal of 221213141112451 is 154211141312122.

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

It is a cyclic number.

It is not a de Polignac number, because 221213141112451 - 2¹³ = 221213141104259 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 7135907777821 = 221213141112451 / (2 + 2 + 1 + 2 + 1 + 3 + 1 + 4 + 1 + 1 + 1 + 2 + 4 + 5 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221213141112461) 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, 3567953888880 + ... + 3567953888941.

It is an arithmetic number, because the mean of its divisors is an integer number (57087262222576).

Almost surely, 2^{221213141112451} is an apocalyptic number.

221213141112451 is a deficient number, since it is larger than the sum of its proper divisors (7135907777853).

221213141112451 is an equidigital number, since it uses as much as digits as its factorization.

221213141112451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7135907777852.

The product of its digits is 3840, while the sum is 31.

Adding to 221213141112451 its reverse (154211141312122), we get a palindrome (375424282424573).

The spelling of 221213141112451 in words is "two hundred twenty-one trillion, two hundred thirteen billion, one hundred forty-one million, one hundred twelve thousand, four hundred fifty-one".