1421821516 has 24 divisors (see below), whose sum is σ = 2514778560. Its totient is φ = 703352832.

The previous prime is 1421821507. The next prime is 1421821529. The reversal of 1421821516 is 6151281241.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145356 + ... + 154828.

It is an arithmetic number, because the mean of its divisors is an integer number (104782440).

Almost surely, 2^1421821516 is an apocalyptic number.

It is an amenable number.

1421821516 is a deficient number, since it is larger than the sum of its proper divisors (1092957044).

1421821516 is a wasteful number, since it uses less digits than its factorization.

1421821516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9873 (or 9871 counting only the distinct ones).

The product of its digits is 3840, while the sum is 31.

The square root of 1421821516 is about 37707.0486248924. The cubic root of 1421821516 is about 1124.4712619245.

The spelling of 1421821516 in words is "one billion, four hundred twenty-one million, eight hundred twenty-one thousand, five hundred sixteen".