1201212020100 has 36 divisors (see below), whose sum is σ = 3475506779024. Its totient is φ = 320323205280.

The previous prime is 1201212020083. The next prime is 1201212020117. The reversal of 1201212020100 is 10202121021.

It is an interprime number because it is at equal distance from previous prime (1201212020083) and next prime (1201212020117).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2002019734 + ... + 2002020333.

Almost surely, 2^{1201212020100} is an apocalyptic number.

1201212020100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201212020100 is an abundant number, since it is smaller than the sum of its proper divisors (2274294758924).

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

1201212020100 is a wasteful number, since it uses less digits than its factorization.

1201212020100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4004040084 (or 4004040077 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1201212020100 its reverse (10202121021), we get a palindrome (1211414141121).

The spelling of 1201212020100 in words is "one trillion, two hundred one billion, two hundred twelve million, twenty thousand, one hundred".