1321020988 has 18 divisors (see below), whose sum is σ = 2689221696. Its totient is φ = 566151768.

The previous prime is 1321020979. The next prime is 1321021007. The reversal of 1321020988 is 8890201231.

It is a super-2 number, since 2×1321020988² = 3490192901472992288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3369756 + ... + 3370147.

Almost surely, 2^1321020988 is an apocalyptic number.

It is an amenable number.

1321020988 is an abundant number, since it is smaller than the sum of its proper divisors (1368200708).

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

1321020988 is a wasteful number, since it uses less digits than its factorization.

1321020988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6739921 (or 6739912 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 1321020988 is about 36345.8524181233. The cubic root of 1321020988 is about 1097.2440619255.

The spelling of 1321020988 in words is "one billion, three hundred twenty-one million, twenty thousand, nine hundred eighty-eight".