1210121213420 has 96 divisors (see below), whose sum is σ = 3122194360320. Its totient is φ = 384698868480.

The previous prime is 1210121213407. The next prime is 1210121213461. The reversal of 1210121213420 is 243121210121.

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 = 1210121213392 and 1210121213401.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4714691 + ... + 4964730.

It is an arithmetic number, because the mean of its divisors is an integer number (32522857920).

Almost surely, 2^{1210121213420} is an apocalyptic number.

1210121213420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1210121213420 is an abundant number, since it is smaller than the sum of its proper divisors (1912073146900).

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

1210121213420 is a wasteful number, since it uses less digits than its factorization.

1210121213420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9679503 (or 9679501 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1210121213420 its reverse (243121210121), we get a palindrome (1453242423541).

The spelling of 1210121213420 in words is "one trillion, two hundred ten billion, one hundred twenty-one million, two hundred thirteen thousand, four hundred twenty".