540236406421 has 4 divisors (see below), whose sum is σ = 541684761772. Its totient is φ = 538788051072.

The previous prime is 540236406419. The next prime is 540236406481. The reversal of 540236406421 is 124604632045.

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 205557958225 + 334678448196 = 453385^2 + 578514^2 .

It is a cyclic number.

It is not a de Polignac number, because 540236406421 - 2¹ = 540236406419 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 (540236406481) 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, 724177116 + ... + 724177861.

It is an arithmetic number, because the mean of its divisors is an integer number (135421190443).

Almost surely, 2^540236406421 is an apocalyptic number.

It is an amenable number.

540236406421 is a deficient number, since it is larger than the sum of its proper divisors (1448355351).

540236406421 is a wasteful number, since it uses less digits than its factorization.

540236406421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1448355350.

The product of its (nonzero) digits is 138240, while the sum is 37.

The spelling of 540236406421 in words is "five hundred forty billion, two hundred thirty-six million, four hundred six thousand, four hundred twenty-one".