21357120254352 has 20 divisors (see below), whose sum is σ = 55172560657200. Its totient is φ = 7119040084768.

The previous prime is 21357120254347. The next prime is 21357120254411. The reversal of 21357120254352 is 25345202175312.

It is a happy number.

It is a super-2 number, since 2×21357120254352² (a number of 27 digits) contains 22 as substring.

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, 222470002602 + ... + 222470002697.

It is an arithmetic number, because the mean of its divisors is an integer number (2758628032860).

Almost surely, 2^{21357120254352} is an apocalyptic number.

It is an amenable number.

21357120254352 is an abundant number, since it is smaller than the sum of its proper divisors (33815440402848).

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

21357120254352 is a wasteful number, since it uses less digits than its factorization.

21357120254352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444940005310 (or 444940005304 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 42.

The spelling of 21357120254352 in words is "twenty-one trillion, three hundred fifty-seven billion, one hundred twenty million, two hundred fifty-four thousand, three hundred fifty-two".