21520525241042 has 8 divisors (see below), whose sum is σ = 32281125295536. Its totient is φ = 10760150142532.

The previous prime is 21520525241029. The next prime is 21520525241053. The reversal of 21520525241042 is 24014252502512.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21520525240993 and 21520525241011.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55999628 + ... + 56382615.

It is an arithmetic number, because the mean of its divisors is an integer number (4035140661942).

Almost surely, 2^{21520525241042} is an apocalyptic number.

21520525241042 is a deficient number, since it is larger than the sum of its proper divisors (10760600054494).

21520525241042 is a wasteful number, since it uses less digits than its factorization.

21520525241042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112477992.

The product of its (nonzero) digits is 64000, while the sum is 35.

Adding to 21520525241042 its reverse (24014252502512), we get a palindrome (45534777743554).

The spelling of 21520525241042 in words is "twenty-one trillion, five hundred twenty billion, five hundred twenty-five million, two hundred forty-one thousand, forty-two".