1212203020100 has 72 divisors (see below), whose sum is σ = 2701552089600. Its totient is φ = 471943216000.

The previous prime is 1212203020097. The next prime is 1212203020103. The reversal of 1212203020100 is 10203022121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1212203020097) and next prime (1212203020103).

It is a super-2 number, since 2×1212203020100² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1212203020103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 421220 + ... + 1613019.

It is an arithmetic number, because the mean of its divisors is an integer number (37521556800).

Almost surely, 2^{1212203020100} is an apocalyptic number.

1212203020100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212203020100 is an abundant number, since it is smaller than the sum of its proper divisors (1489349069500).

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

1212203020100 is a wasteful number, since it uses less digits than its factorization.

1212203020100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2034413 (or 2034406 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 1212203020100 its reverse (10203022121), we get a palindrome (1222406042221).

The spelling of 1212203020100 in words is "one trillion, two hundred twelve billion, two hundred three million, twenty thousand, one hundred".