212154104245 has 4 divisors (see below), whose sum is σ = 254584925100. Its totient is φ = 169723283392.

The previous prime is 212154104221. The next prime is 212154104251. The reversal of 212154104245 is 542401451212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 160968661681 + 51185442564 = 401209^2 + 226242^2 .

It is a cyclic number.

It is not a de Polignac number, because 212154104245 - 2³⁵ = 177794365877 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21215410420 + ... + 21215410429.

It is an arithmetic number, because the mean of its divisors is an integer number (63646231275).

Almost surely, 2^212154104245 is an apocalyptic number.

It is an amenable number.

212154104245 is a deficient number, since it is larger than the sum of its proper divisors (42430820855).

212154104245 is an equidigital number, since it uses as much as digits as its factorization.

212154104245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42430820854.

The product of its (nonzero) digits is 12800, while the sum is 31.

Adding to 212154104245 its reverse (542401451212), we get a palindrome (754555555457).

The spelling of 212154104245 in words is "two hundred twelve billion, one hundred fifty-four million, one hundred four thousand, two hundred forty-five".