21135114154 has 16 divisors (see below), whose sum is σ = 39525408576. Its totient is φ = 8234460000.

The previous prime is 21135114089. The next prime is 21135114173. The reversal of 21135114154 is 45141153112.

It is a happy number.

It is a super-2 number, since 2×21135114154² (a number of 21 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 7 ways as a sum of consecutive naturals, for example, 68620347 + ... + 68620654.

It is an arithmetic number, because the mean of its divisors is an integer number (2470338036).

Almost surely, 2^21135114154 is an apocalyptic number.

21135114154 is a deficient number, since it is larger than the sum of its proper divisors (18390294422).

21135114154 is a wasteful number, since it uses less digits than its factorization.

21135114154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137241021.

The product of its digits is 2400, while the sum is 28.

Adding to 21135114154 its reverse (45141153112), we get a palindrome (66276267266).

The spelling of 21135114154 in words is "twenty-one billion, one hundred thirty-five million, one hundred fourteen thousand, one hundred fifty-four".