1021220997 has 8 divisors (see below), whose sum is σ = 1361818656. Its totient is φ = 680718672.

The previous prime is 1021220969. The next prime is 1021221041. The reversal of 1021220997 is 7990221201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1021220997 - 2⁸ = 1021220741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021220927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6783 + ... + 45699.

It is an arithmetic number, because the mean of its divisors is an integer number (170227332).

Almost surely, 2^1021220997 is an apocalyptic number.

It is an amenable number.

1021220997 is a deficient number, since it is larger than the sum of its proper divisors (340597659).

1021220997 is an equidigital number, since it uses as much as digits as its factorization.

1021220997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47667.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 1021220997 is about 31956.5485777172. The cubic root of 1021220997 is about 1007.0242106082.

The spelling of 1021220997 in words is "one billion, twenty-one million, two hundred twenty thousand, nine hundred ninety-seven".