212154220451 has 4 divisors (see below), whose sum is σ = 212155253952. Its totient is φ = 212153186952.

The previous prime is 212154220441. The next prime is 212154220477. The reversal of 212154220451 is 154022451212.

It is a semiprime because it is the product of two primes, 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 212154220451 - 2³⁴ = 194974351267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212154220441) 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, 93011 + ... + 657996.

It is an arithmetic number, because the mean of its divisors is an integer number (53038813488).

Almost surely, 2^212154220451 is an apocalyptic number.

212154220451 is a deficient number, since it is larger than the sum of its proper divisors (1033501).

212154220451 is an equidigital number, since it uses as much as digits as its factorization.

212154220451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033500.

The product of its (nonzero) digits is 6400, while the sum is 29.

Adding to 212154220451 its reverse (154022451212), we get a palindrome (366176671663).

The spelling of 212154220451 in words is "two hundred twelve billion, one hundred fifty-four million, two hundred twenty thousand, four hundred fifty-one".