21811401524057 has 16 divisors (see below), whose sum is σ = 22892607504000. Its totient is φ = 20752427566080.

The previous prime is 21811401524047. The next prime is 21811401524083. The reversal of 21811401524057 is 75042510411812.

It is a cyclic number.

It is not a de Polignac number, because 21811401524057 - 2⁴ = 21811401524041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21811401524047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1560569 + ... + 6786617.

It is an arithmetic number, because the mean of its divisors is an integer number (1430787969000).

Almost surely, 2^{21811401524057} is an apocalyptic number.

It is an amenable number.

21811401524057 is a deficient number, since it is larger than the sum of its proper divisors (1081205979943).

21811401524057 is a wasteful number, since it uses less digits than its factorization.

21811401524057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5228176.

The product of its (nonzero) digits is 89600, while the sum is 41.

Adding to 21811401524057 its reverse (75042510411812), we get a palindrome (96853911935869).

The spelling of 21811401524057 in words is "twenty-one trillion, eight hundred eleven billion, four hundred one million, five hundred twenty-four thousand, fifty-seven".