1671200421 has 16 divisors (see below), whose sum is σ = 2509252608. Its totient is φ = 980175600.

The previous prime is 1671200413. The next prime is 1671200449. The reversal of 1671200421 is 1240021761.

It is not a de Polignac number, because 1671200421 - 2³ = 1671200413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1671200391 and 1671200400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1671200411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 815791 + ... + 817836.

It is an arithmetic number, because the mean of its divisors is an integer number (156828288).

Almost surely, 2^1671200421 is an apocalyptic number.

1671200421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1671200421 is a deficient number, since it is larger than the sum of its proper divisors (838052187).

1671200421 is a wasteful number, since it uses less digits than its factorization.

1671200421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633672.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 1671200421 is about 40880.3182595244. The cubic root of 1671200421 is about 1186.7052001736.

The spelling of 1671200421 in words is "one billion, six hundred seventy-one million, two hundred thousand, four hundred twenty-one".