1965097021 has 8 divisors (see below), whose sum is σ = 2072851200. Its totient is φ = 1857775680.

The previous prime is 1965097003. The next prime is 1965097073. The reversal of 1965097021 is 1207905691.

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 1965097021 - 2⁵ = 1965096989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1965097091) 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, 98860 + ... + 117061.

It is an arithmetic number, because the mean of its divisors is an integer number (259106400).

Almost surely, 2^1965097021 is an apocalyptic number.

It is an amenable number.

1965097021 is a deficient number, since it is larger than the sum of its proper divisors (107754179).

1965097021 is a wasteful number, since it uses less digits than its factorization.

1965097021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216419.

The product of its (nonzero) digits is 34020, while the sum is 40.

The square root of 1965097021 is about 44329.4148506384. The cubic root of 1965097021 is about 1252.5488303851.

The spelling of 1965097021 in words is "one billion, nine hundred sixty-five million, ninety-seven thousand, twenty-one".