1023661021 has 8 divisors (see below), whose sum is σ = 1032449024. Its totient is φ = 1014884640.

The previous prime is 1023661019. The next prime is 1023661039. The reversal of 1023661021 is 1201663201.

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

It is a cyclic number.

It is not a de Polignac number, because 1023661021 - 2¹ = 1023661019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1023660983 and 1023661001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023661421) 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, 343066 + ... + 346036.

It is an arithmetic number, because the mean of its divisors is an integer number (129056128).

Almost surely, 2^1023661021 is an apocalyptic number.

It is an amenable number.

1023661021 is a deficient number, since it is larger than the sum of its proper divisors (8788003).

1023661021 is a wasteful number, since it uses less digits than its factorization.

1023661021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5811.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1023661021 is about 31994.7030147179. The cubic root of 1023661021 is about 1007.8256071261.

The spelling of 1023661021 in words is "one billion, twenty-three million, six hundred sixty-one thousand, twenty-one".