21425601340 has 48 divisors (see below), whose sum is σ = 52859812320. Its totient is φ = 7191809280.

The previous prime is 21425601311. The next prime is 21425601371. The reversal of 21425601340 is 4310652412.

It is a junction number, because it is equal to n+sod(n) for n = 21425601299 and 21425601308.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3742875 + ... + 3748594.

It is an arithmetic number, because the mean of its divisors is an integer number (1101246090).

Almost surely, 2^21425601340 is an apocalyptic number.

21425601340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21425601340 is an abundant number, since it is smaller than the sum of its proper divisors (31434210980).

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

21425601340 is a wasteful number, since it uses less digits than its factorization.

21425601340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7491502 (or 7491500 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The spelling of 21425601340 in words is "twenty-one billion, four hundred twenty-five million, six hundred one thousand, three hundred forty".