1021212221193 has 16 divisors (see below), whose sum is σ = 1601901524160. Its totient is φ = 640760609088.

The previous prime is 1021212221173. The next prime is 1021212221207. The reversal of 1021212221193 is 3911222121201.

It is not a de Polignac number, because 1021212221193 - 2⁸ = 1021212220937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1021212221173) 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, 1112431155 + ... + 1112432072.

It is an arithmetic number, because the mean of its divisors is an integer number (100118845260).

Almost surely, 2^{1021212221193} is an apocalyptic number.

It is an amenable number.

1021212221193 is a deficient number, since it is larger than the sum of its proper divisors (580689302967).

1021212221193 is a wasteful number, since it uses less digits than its factorization.

1021212221193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2224863253 (or 2224863247 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

Adding to 1021212221193 its reverse (3911222121201), we get a palindrome (4932434342394).

The spelling of 1021212221193 in words is "one trillion, twenty-one billion, two hundred twelve million, two hundred twenty-one thousand, one hundred ninety-three".