21121153214554 has 8 divisors (see below), whose sum is σ = 31681788522048. Its totient is φ = 10560557040540.

The previous prime is 21121153214531. The next prime is 21121153214617. The reversal of 21121153214554 is 45541235112112.

It is a happy number.

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

It is a super-3 number, since 3×21121153214554³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8394642 + ... + 10616605.

It is an arithmetic number, because the mean of its divisors is an integer number (3960223565256).

Almost surely, 2^{21121153214554} is an apocalyptic number.

21121153214554 is a deficient number, since it is larger than the sum of its proper divisors (10560635307494).

21121153214554 is a wasteful number, since it uses less digits than its factorization.

21121153214554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19566740.

The product of its digits is 48000, while the sum is 37.

Adding to 21121153214554 its reverse (45541235112112), we get a palindrome (66662388326666).

The spelling of 21121153214554 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred fifty-three million, two hundred fourteen thousand, five hundred fifty-four".