1331421155551 has 8 divisors (see below), whose sum is σ = 1414551451824. Its totient is φ = 1248825459840.

The previous prime is 1331421155549. The next prime is 1331421155563. The reversal of 1331421155551 is 1555511241331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1331421155551 - 2¹ = 1331421155549 is a prime.

It is a super-2 number, since 2×1331421155551² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1331421155551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331421155951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133645005 + ... + 133654966.

It is an arithmetic number, because the mean of its divisors is an integer number (176818931478).

Almost surely, 2^{1331421155551} is an apocalyptic number.

1331421155551 is a deficient number, since it is larger than the sum of its proper divisors (83130296273).

1331421155551 is a wasteful number, since it uses less digits than its factorization.

1331421155551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267300281.

The product of its digits is 45000, while the sum is 37.

Adding to 1331421155551 its reverse (1555511241331), we get a palindrome (2886932396882).

The spelling of 1331421155551 in words is "one trillion, three hundred thirty-one billion, four hundred twenty-one million, one hundred fifty-five thousand, five hundred fifty-one".