45212212121 has 4 divisors (see below), whose sum is σ = 46314949044. Its totient is φ = 44109475200.

The previous prime is 45212212117. The next prime is 45212212141. The reversal of 45212212121 is 12121221254.

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 8017232521 + 37194979600 = 89539^2 + 192860^2 .

It is a cyclic number.

It is not a de Polignac number, because 45212212121 - 2² = 45212212117 is a prime.

It is a super-3 number, since 3×45212212121³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45212212141) 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, 551368400 + ... + 551368481.

It is an arithmetic number, because the mean of its divisors is an integer number (11578737261).

Almost surely, 2^45212212121 is an apocalyptic number.

45212212121 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

45212212121 is a deficient number, since it is larger than the sum of its proper divisors (1102736923).

45212212121 is a wasteful number, since it uses less digits than its factorization.

45212212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102736922.

The product of its digits is 640, while the sum is 23.

Adding to 45212212121 its reverse (12121221254), we get a palindrome (57333433375).

The spelling of 45212212121 in words is "forty-five billion, two hundred twelve million, two hundred twelve thousand, one hundred twenty-one".