1213422201551 has 16 divisors (see below), whose sum is σ = 1432118688000. Its totient is φ = 1027545110424.

The previous prime is 1213422201539. The next prime is 1213422201557. The reversal of 1213422201551 is 1551022243121.

It is not a de Polignac number, because 1213422201551 - 2⁶ = 1213422201487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213422201557) 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, 21282821 + ... + 21339758.

It is an arithmetic number, because the mean of its divisors is an integer number (89507418000).

Almost surely, 2^{1213422201551} is an apocalyptic number.

1213422201551 is a deficient number, since it is larger than the sum of its proper divisors (218696486449).

1213422201551 is an frugal number, since it uses more digits than its factorization.

1213422201551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42622683 (or 42622669 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 1213422201551 its reverse (1551022243121), we get a palindrome (2764444444672).

The spelling of 1213422201551 in words is "one trillion, two hundred thirteen billion, four hundred twenty-two million, two hundred one thousand, five hundred fifty-one".