1021397211 has 6 divisors (see below), whose sum is σ = 1475351540. Its totient is φ = 680931468.

The previous prime is 1021397183. The next prime is 1021397227. The reversal of 1021397211 is 1127931201.

It is not a de Polignac number, because 1021397211 - 2²³ = 1013008603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021397261) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 56744281 + ... + 56744298.

Almost surely, 2^1021397211 is an apocalyptic number.

1021397211 is a deficient number, since it is larger than the sum of its proper divisors (453954329).

1021397211 is a wasteful number, since it uses less digits than its factorization.

1021397211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113488585 (or 113488582 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 1021397211 is about 31959.3055462724. The cubic root of 1021397211 is about 1007.0821287145.

The spelling of 1021397211 in words is "one billion, twenty-one million, three hundred ninety-seven thousand, two hundred eleven".