1021212103 has 4 divisors (see below), whose sum is σ = 1021614040. Its totient is φ = 1020810168.

The previous prime is 1021212091. The next prime is 1021212107. The reversal of 1021212103 is 3012121201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3012121201 = 4201 ⋅717001.

It is a cyclic number.

It is not a de Polignac number, because 1021212103 - 2¹⁷ = 1021081031 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 (1021212107) 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, 197133 + ... + 202246.

It is an arithmetic number, because the mean of its divisors is an integer number (255403510).

Almost surely, 2^1021212103 is an apocalyptic number.

1021212103 is a deficient number, since it is larger than the sum of its proper divisors (401937).

1021212103 is an equidigital number, since it uses as much as digits as its factorization.

1021212103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401936.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1021212103 is about 31956.4094197080. The cubic root of 1021212103 is about 1007.0212871472.

Adding to 1021212103 its reverse (3012121201), we get a palindrome (4033333304).

The spelling of 1021212103 in words is "one billion, twenty-one million, two hundred twelve thousand, one hundred three".