1212521102120 has 32 divisors (see below), whose sum is σ = 2752315609320. Its totient is φ = 480716328960.

The previous prime is 1212521102083. The next prime is 1212521102173. The reversal of 1212521102120 is 212011252121.

It can be written as a sum of positive squares in 4 ways, for example, as 986958797764 + 225562304356 = 993458^2 + 474934^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1212521102092 and 1212521102101.

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, 134123921 + ... + 134132960.

Almost surely, 2^{1212521102120} is an apocalyptic number.

1212521102120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212521102120 is an abundant number, since it is smaller than the sum of its proper divisors (1539794507200).

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

1212521102120 is a wasteful number, since it uses less digits than its factorization.

1212521102120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268257005 (or 268257001 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

Adding to 1212521102120 its reverse (212011252121), we get a palindrome (1424532354241).

The spelling of 1212521102120 in words is "one trillion, two hundred twelve billion, five hundred twenty-one million, one hundred two thousand, one hundred twenty".