1021222002078 has 40 divisors (see below), whose sum is σ = 2322447408072. Its totient is φ = 335326623984.

The previous prime is 1021222002077. The next prime is 1021222002079. The reversal of 1021222002078 is 8702002221201.

It is an interprime number because it is at equal distance from previous prime (1021222002077) and next prime (1021222002079).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021222002077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 47032725 + ... + 47054432.

Almost surely, 2^{1021222002078} is an apocalyptic number.

1021222002078 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1021222002078 is an abundant number, since it is smaller than the sum of its proper divisors (1301225405994).

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

1021222002078 is an equidigital number, since it uses as much as digits as its factorization.

1021222002078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94087238 (or 94087229 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

Adding to 1021222002078 its reverse (8702002221201), we get a palindrome (9723224223279).

The spelling of 1021222002078 in words is "one trillion, twenty-one billion, two hundred twenty-two million, two thousand, seventy-eight".