35981021 has 4 divisors (see below), whose sum is σ = 36055392. Its totient is φ = 35906652.

The previous prime is 35980999. The next prime is 35981053. The reversal of 35981021 is 12018953.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 35981021 - 2¹⁴ = 35964637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (35981221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36455 + ... + 37428.

It is an arithmetic number, because the mean of its divisors is an integer number (9013848).

Almost surely, 2^35981021 is an apocalyptic number.

It is an amenable number.

35981021 is a deficient number, since it is larger than the sum of its proper divisors (74371).

35981021 is an equidigital number, since it uses as much as digits as its factorization.

35981021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74370.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 35981021 is about 5998.4182081612. The cubic root of 35981021 is about 330.1346894329.

Adding to 35981021 its reverse (12018953), we get a palindrome (47999974).

The spelling of 35981021 in words is "thirty-five million, nine hundred eighty-one thousand, twenty-one".