21400352541 has 6 divisors (see below), whose sum is σ = 30911620350. Its totient is φ = 14266901688.

The previous prime is 21400352537. The next prime is 21400352591. The reversal of 21400352541 is 14525300412.

21400352541 is a `hidden beast` number, since 2 + 1 + 400 + 3 + 5 + 254 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14302964025 + 7097388516 = 119595^2 + 84246^2 .

It is not a de Polignac number, because 21400352541 - 2² = 21400352537 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400352591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1188908466 + ... + 1188908483.

It is an arithmetic number, because the mean of its divisors is an integer number (5151936725).

Almost surely, 2^21400352541 is an apocalyptic number.

It is an amenable number.

21400352541 is a deficient number, since it is larger than the sum of its proper divisors (9511267809).

21400352541 is a wasteful number, since it uses less digits than its factorization.

21400352541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2377816955 (or 2377816952 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 21400352541 its reverse (14525300412), we get a palindrome (35925652953).

The spelling of 21400352541 in words is "twenty-one billion, four hundred million, three hundred fifty-two thousand, five hundred forty-one".