201877440421 has 4 divisors (see below), whose sum is σ = 208838731500. Its totient is φ = 194916149344.

The previous prime is 201877440419. The next prime is 201877440449. The reversal of 201877440421 is 124044778102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37276024900 + 164601415521 = 193070^2 + 405711^2 .

It is a cyclic number.

It is not a de Polignac number, because 201877440421 - 2¹ = 201877440419 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 (201877440461) 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, 3480645496 + ... + 3480645553.

It is an arithmetic number, because the mean of its divisors is an integer number (52209682875).

Almost surely, 2^201877440421 is an apocalyptic number.

It is an amenable number.

201877440421 is a deficient number, since it is larger than the sum of its proper divisors (6961291079).

201877440421 is an equidigital number, since it uses as much as digits as its factorization.

201877440421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6961291078.

The product of its (nonzero) digits is 100352, while the sum is 40.

The spelling of 201877440421 in words is "two hundred one billion, eight hundred seventy-seven million, four hundred forty thousand, four hundred twenty-one".