1212421203125 has 112 divisors (see below), whose sum is σ = 1719169244352. Its totient is φ = 847224000000.

The previous prime is 1212421203107. The next prime is 1212421203127. The reversal of 1212421203125 is 5213021242121.

It is not a de Polignac number, because 1212421203125 - 2²⁸ = 1212152767669 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212421203094 and 1212421203103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212421203127) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 527826977 + ... + 527829273.

It is an arithmetic number, because the mean of its divisors is an integer number (15349725396).

Almost surely, 2^{1212421203125} is an apocalyptic number.

It is an amenable number.

1212421203125 is a deficient number, since it is larger than the sum of its proper divisors (506748041227).

1212421203125 is an frugal number, since it uses more digits than its factorization.

1212421203125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2458 (or 2433 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 1212421203125 its reverse (5213021242121), we get a palindrome (6425442445246).

The spelling of 1212421203125 in words is "one trillion, two hundred twelve billion, four hundred twenty-one million, two hundred three thousand, one hundred twenty-five".