1213021403121 has 16 divisors (see below), whose sum is σ = 1807428788928. Its totient is φ = 717233644800.

The previous prime is 1213021403107. The next prime is 1213021403123. The reversal of 1213021403121 is 1213041203121.

It is not a de Polignac number, because 1213021403121 - 2⁷ = 1213021402993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1213021403123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 448269676 + ... + 448272381.

It is an arithmetic number, because the mean of its divisors is an integer number (112964299308).

Almost surely, 2^{1213021403121} is an apocalyptic number.

1213021403121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1213021403121 is a deficient number, since it is larger than the sum of its proper divisors (594407385807).

1213021403121 is a wasteful number, since it uses less digits than its factorization.

1213021403121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 896542112.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1213021403121 its reverse (1213041203121), we get a palindrome (2426062606242).

The spelling of 1213021403121 in words is "one trillion, two hundred thirteen billion, twenty-one million, four hundred three thousand, one hundred twenty-one".