21520554350102 has 32 divisors (see below), whose sum is σ = 33435179326080. Its totient is φ = 10376413640320.

The previous prime is 21520554350101. The next prime is 21520554350129. The reversal of 21520554350102 is 20105345502512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21520554350101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 459297308 + ... + 459344160.

It is an arithmetic number, because the mean of its divisors is an integer number (1044849353940).

Almost surely, 2^{21520554350102} is an apocalyptic number.

21520554350102 is a deficient number, since it is larger than the sum of its proper divisors (11914624975978).

21520554350102 is a wasteful number, since it uses less digits than its factorization.

21520554350102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56488.

The product of its (nonzero) digits is 60000, while the sum is 35.

Adding to 21520554350102 its reverse (20105345502512), we get a palindrome (41625899852614).

The spelling of 21520554350102 in words is "twenty-one trillion, five hundred twenty billion, five hundred fifty-four million, three hundred fifty thousand, one hundred two".