1021712680 has 64 divisors (see below), whose sum is σ = 2367066240. Its totient is φ = 396678912.

The previous prime is 1021712591. The next prime is 1021712687. The reversal of 1021712680 is 862171201.

It is not an unprimeable number, because it can be changed into a prime (1021712687) 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, 285462 + ... + 289018.

It is an arithmetic number, because the mean of its divisors is an integer number (36985410).

Almost surely, 2^1021712680 is an apocalyptic number.

1021712680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021712680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1183533120).

1021712680 is an abundant number, since it is smaller than the sum of its proper divisors (1345353560).

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

1021712680 is a wasteful number, since it uses less digits than its factorization.

1021712680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3778 (or 3774 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 1021712680 is about 31964.2406448206. The cubic root of 1021712680 is about 1007.1858005885.

Adding to 1021712680 its reverse (862171201), we get a palindrome (1883883881).

The spelling of 1021712680 in words is "one billion, twenty-one million, seven hundred twelve thousand, six hundred eighty".