2021111200078 has 4 divisors (see below), whose sum is σ = 3031666800120. Its totient is φ = 1010555600038.

The previous prime is 2021111200063. The next prime is 2021111200079. The reversal of 2021111200078 is 8700021111202.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021111200079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505277800018 + ... + 505277800021.

It is an arithmetic number, because the mean of its divisors is an integer number (757916700030).

Almost surely, 2^{2021111200078} is an apocalyptic number.

2021111200078 is a deficient number, since it is larger than the sum of its proper divisors (1010555600042).

2021111200078 is a wasteful number, since it uses less digits than its factorization.

2021111200078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010555600041.

The product of its (nonzero) digits is 448, while the sum is 25.

The spelling of 2021111200078 in words is "two trillion, twenty-one billion, one hundred eleven million, two hundred thousand, seventy-eight".