1200122209978 has 16 divisors (see below), whose sum is σ = 1888487602560. Its totient is φ = 571209209200.

The previous prime is 1200122209969. The next prime is 1200122210033. The reversal of 1200122209978 is 8799022210021.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145712518 + ... + 145720753.

It is an arithmetic number, because the mean of its divisors is an integer number (118030475160).

Almost surely, 2^{1200122209978} is an apocalyptic number.

1200122209978 is a deficient number, since it is larger than the sum of its proper divisors (688365392582).

1200122209978 is a wasteful number, since it uses less digits than its factorization.

1200122209978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291433373.

The product of its (nonzero) digits is 72576, while the sum is 43.

Adding to 1200122209978 its sum of digits (43), we get a palindrome (1200122210021).

Adding to 1200122209978 its reverse (8799022210021), we get a palindrome (9999144419999).

The spelling of 1200122209978 in words is "one trillion, two hundred billion, one hundred twenty-two million, two hundred nine thousand, nine hundred seventy-eight".