1212121142920 has 32 divisors (see below), whose sum is σ = 2727306855000. Its totient is φ = 484842362368.

The previous prime is 1212121142891. The next prime is 1212121142923. The reversal of 1212121142920 is 292411212121.

It can be written as a sum of positive squares in 4 ways, for example, as 313557441444 + 898563701476 = 559962^2 + 947926^2 .

It is a super-2 number, since 2×1212121142920² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1212121142923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4393206 + ... + 4660954.

Almost surely, 2^{1212121142920} is an apocalyptic number.

1212121142920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212121142920 is an abundant number, since it is smaller than the sum of its proper divisors (1515185712080).

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

1212121142920 is a wasteful number, since it uses less digits than its factorization.

1212121142920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380937 (or 380933 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The spelling of 1212121142920 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, one hundred forty-two thousand, nine hundred twenty".