21121025252652 has 72 divisors (see below), whose sum is σ = 60878249280576. Its totient is φ = 6116495998464.

The previous prime is 21121025252633. The next prime is 21121025252653. The reversal of 21121025252652 is 25625252012112.

21121025252652 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 102 + 525 + 26 + 5 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21121025252653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1327356628 + ... + 1327372539.

It is an arithmetic number, because the mean of its divisors is an integer number (845531240008).

Almost surely, 2^{21121025252652} is an apocalyptic number.

It is an amenable number.

21121025252652 is an abundant number, since it is smaller than the sum of its proper divisors (39757224027924).

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

21121025252652 is a wasteful number, since it uses less digits than its factorization.

21121025252652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2654729207 (or 2654729202 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

Adding to 21121025252652 its reverse (25625252012112), we get a palindrome (46746277264764).

The spelling of 21121025252652 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-five million, two hundred fifty-two thousand, six hundred fifty-two".