201387143021 has 4 divisors (see below), whose sum is σ = 201390604992. Its totient is φ = 201383681052.

The previous prime is 201387143003. The next prime is 201387143063. The reversal of 201387143021 is 120341783102.

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 a de Polignac number, because none of the positive numbers 2^k-201387143021 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 (201387143081) 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, 1642211 + ... + 1760576.

It is an arithmetic number, because the mean of its divisors is an integer number (50347651248).

Almost surely, 2^201387143021 is an apocalyptic number.

It is an amenable number.

201387143021 is a deficient number, since it is larger than the sum of its proper divisors (3461971).

201387143021 is an equidigital number, since it uses as much as digits as its factorization.

201387143021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3461970.

The product of its (nonzero) digits is 8064, while the sum is 32.

The spelling of 201387143021 in words is "two hundred one billion, three hundred eighty-seven million, one hundred forty-three thousand, twenty-one".