21121140121452 has 216 divisors, whose sum is σ = 64577612211840. Its totient is φ = 5797317173760.

The previous prime is 21121140121427. The next prime is 21121140121489. The reversal of 21121140121452 is 25412104112112.

It is a happy number.

21121140121452 is a `hidden beast` number, since 2 + 1 + 1 + 211 + 401 + 2 + 1 + 45 + 2 = 666.

It is a super-2 number, since 2×21121140121452² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 6082074 + ... + 8901342.

Almost surely, 2^{21121140121452} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21121140121452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32288806105920).

21121140121452 is an abundant number, since it is smaller than the sum of its proper divisors (43456472090388).

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

21121140121452 is a wasteful number, since it uses less digits than its factorization.

21121140121452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2819461 (or 2819449 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

Adding to 21121140121452 its reverse (25412104112112), we get a palindrome (46533244233564).

The spelling of 21121140121452 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred forty million, one hundred twenty-one thousand, four hundred fifty-two".