1021660437 has 48 divisors (see below), whose sum is σ = 1659657600. Its totient is φ = 556351488.

The previous prime is 1021660433. The next prime is 1021660439. The reversal of 1021660437 is 7340661201.

It is not a de Polignac number, because 1021660437 - 2² = 1021660433 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021660433) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1517733 + ... + 1518405.

It is an arithmetic number, because the mean of its divisors is an integer number (34576200).

Almost surely, 2^1021660437 is an apocalyptic number.

It is an amenable number.

1021660437 is a deficient number, since it is larger than the sum of its proper divisors (637997163).

1021660437 is a wasteful number, since it uses less digits than its factorization.

1021660437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162 (or 1155 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 1021660437 is about 31963.4234242830. The cubic root of 1021660437 is about 1007.1686335625.

The spelling of 1021660437 in words is "one billion, twenty-one million, six hundred sixty thousand, four hundred thirty-seven".