1021121212103 has 4 divisors (see below), whose sum is σ = 1028916030648. Its totient is φ = 1013326393560.

The previous prime is 1021121212081. The next prime is 1021121212117. The reversal of 1021121212103 is 3012121211201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1021121212103 - 2¹⁶ = 1021121146567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021121212403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3897409076 + ... + 3897409337.

It is an arithmetic number, because the mean of its divisors is an integer number (257229007662).

Almost surely, 2^{1021121212103} is an apocalyptic number.

1021121212103 is a deficient number, since it is larger than the sum of its proper divisors (7794818545).

1021121212103 is an equidigital number, since it uses as much as digits as its factorization.

1021121212103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7794818544.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1021121212103 its reverse (3012121211201), we get a palindrome (4033242423304).

The spelling of 1021121212103 in words is "one trillion, twenty-one billion, one hundred twenty-one million, two hundred twelve thousand, one hundred three".