1421728208072 has 16 divisors (see below), whose sum is σ = 2695692530700. Its totient is φ = 702876866560.

The previous prime is 1421728208063. The next prime is 1421728208081. The reversal of 1421728208072 is 2708028271241.

It is an interprime number because it is at equal distance from previous prime (1421728208063) and next prime (1421728208081).

It can be written as a sum of positive squares in 2 ways, for example, as 1110928648036 + 310799560036 = 1054006^2 + 557494^2 .

It is a super-2 number, since 2×1421728208072² (a number of 25 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, 998403929 + ... + 998405352.

Almost surely, 2^{1421728208072} is an apocalyptic number.

It is an amenable number.

1421728208072 is a deficient number, since it is larger than the sum of its proper divisors (1273964322628).

1421728208072 is a wasteful number, since it uses less digits than its factorization.

1421728208072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1996809376 (or 1996809372 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 44.

The spelling of 1421728208072 in words is "one trillion, four hundred twenty-one billion, seven hundred twenty-eight million, two hundred eight thousand, seventy-two".