203421872860816 has 45 divisors (see below), whose sum is σ = 407257411187529. Its totient is φ = 98429082724800.

The previous prime is 203421872860813. The next prime is 203421872860853. The reversal of 203421872860816 is 618068278124302.

The square root of 203421872860816 is 14262604.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 202715062742416 + 706810118400 = 14237804^2 + 840720^2 .

It is a super-2 number, since 2×203421872860816² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (203421872860813) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1768505386 + ... + 1768620406.

Almost surely, 2^{203421872860816} is an apocalyptic number.

203421872860816 is the 14262604-th square number.

It is an amenable number.

203421872860816 is an abundant number, since it is smaller than the sum of its proper divisors (203835538326713).

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

203421872860816 is an frugal number, since it uses more digits than its factorization.

203421872860816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230112 (or 115054 counting only the distinct ones).

The product of its (nonzero) digits is 12386304, while the sum is 58.

The spelling of 203421872860816 in words is "two hundred three trillion, four hundred twenty-one billion, eight hundred seventy-two million, eight hundred sixty thousand, eight hundred sixteen".