21400242101 has 8 divisors (see below), whose sum is σ = 24858361344. Its totient is φ = 18042358320.

The previous prime is 21400242023. The next prime is 21400242191. The reversal of 21400242101 is 10124200412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21400242101 - 2²² = 21396047797 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21400242101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400242191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25058405 + ... + 25059258.

It is an arithmetic number, because the mean of its divisors is an integer number (3107295168).

Almost surely, 2^21400242101 is an apocalyptic number.

It is an amenable number.

21400242101 is a deficient number, since it is larger than the sum of its proper divisors (3458119243).

21400242101 is an equidigital number, since it uses as much as digits as its factorization.

21400242101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50117731.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21400242101 its reverse (10124200412), we get a palindrome (31524442513).

The spelling of 21400242101 in words is "twenty-one billion, four hundred million, two hundred forty-two thousand, one hundred one".