21133431131154 has 32 divisors (see below), whose sum is σ = 42635345363520. Its totient is φ = 6983216539200.

The previous prime is 21133431131119. The next prime is 21133431131299. The reversal of 21133431131154 is 45113113433112.

It is a happy number.

It is a super-2 number, since 2×21133431131154² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18616537 + ... + 19719084.

It is an arithmetic number, because the mean of its divisors is an integer number (1332354542610).

Almost surely, 2^{21133431131154} is an apocalyptic number.

21133431131154 is an abundant number, since it is smaller than the sum of its proper divisors (21501914232366).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21133431131154 is a wasteful number, since it uses less digits than its factorization.

21133431131154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38336426.

The product of its digits is 12960, while the sum is 33.

Adding to 21133431131154 its reverse (45113113433112), we get a palindrome (66246544564266).

The spelling of 21133431131154 in words is "twenty-one trillion, one hundred thirty-three billion, four hundred thirty-one million, one hundred thirty-one thousand, one hundred fifty-four".