1212251423355 has 96 divisors (see below), whose sum is σ = 2490914409984. Its totient is φ = 554047278336.

The previous prime is 1212251423303. The next prime is 1212251423377. The reversal of 1212251423355 is 5533241522121.

1212251423355 is a `hidden beast` number, since 1 + 2 + 1 + 225 + 1 + 423 + 3 + 5 + 5 = 666.

It is not a de Polignac number, because 1212251423355 - 2¹¹ = 1212251421307 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 45258727 + ... + 45285503.

It is an arithmetic number, because the mean of its divisors is an integer number (25947025104).

Almost surely, 2^{1212251423355} is an apocalyptic number.

1212251423355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1212251423355 is an abundant number, since it is smaller than the sum of its proper divisors (1278662986629).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1212251423355 is an equidigital number, since it uses as much as digits as its factorization.

1212251423355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32127 (or 32115 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

Adding to 1212251423355 its reverse (5533241522121), we get a palindrome (6745492945476).

The spelling of 1212251423355 in words is "one trillion, two hundred twelve billion, two hundred fifty-one million, four hundred twenty-three thousand, three hundred fifty-five".