21425399207708 has 6 divisors (see below), whose sum is σ = 37494448613496. Its totient is φ = 10712699603852.

The previous prime is 21425399207669. The next prime is 21425399207731. The reversal of 21425399207708 is 80770299352412.

It is a super-2 number, since 2×21425399207708² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2678174900960 + ... + 2678174900967.

It is an arithmetic number, because the mean of its divisors is an integer number (6249074768916).

Almost surely, 2^{21425399207708} is an apocalyptic number.

It is an amenable number.

21425399207708 is a deficient number, since it is larger than the sum of its proper divisors (16069049405788).

21425399207708 is a wasteful number, since it uses less digits than its factorization.

21425399207708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5356349801931 (or 5356349801929 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 59.

The spelling of 21425399207708 in words is "twenty-one trillion, four hundred twenty-five billion, three hundred ninety-nine million, two hundred seven thousand, seven hundred eight".