21625016135140 has 48 divisors (see below), whose sum is σ = 50693061101760. Its totient is φ = 7680766826880.

The previous prime is 21625016135137. The next prime is 21625016135143. The reversal of 21625016135140 is 4153161052612.

It is an interprime number because it is at equal distance from previous prime (21625016135137) and next prime (21625016135143).

It is a self number, because there is not a number n which added to its sum of digits gives 21625016135140.

It is not an unprimeable number, because it can be changed into a prime (21625016135143) 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, 1142961795 + ... + 1142980714.

It is an arithmetic number, because the mean of its divisors is an integer number (1056105439620).

Almost surely, 2^{21625016135140} is an apocalyptic number.

21625016135140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21625016135140 is an abundant number, since it is smaller than the sum of its proper divisors (29068044966620).

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

21625016135140 is a wasteful number, since it uses less digits than its factorization.

21625016135140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285942572 (or 2285942570 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

Adding to 21625016135140 its reverse (4153161052612), we get a palindrome (25778177187752).

The spelling of 21625016135140 in words is "twenty-one trillion, six hundred twenty-five billion, sixteen million, one hundred thirty-five thousand, one hundred forty".