21357024101 has 4 divisors (see below), whose sum is σ = 24408027552. Its totient is φ = 18306020652.

The previous prime is 21357024067. The next prime is 21357024121. The reversal of 21357024101 is 10142075312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21357024101 - 2¹⁴ = 21357007717 is a prime.

It is a super-2 number, since 2×21357024101² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21357024121) 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, 1525501715 + ... + 1525501728.

It is an arithmetic number, because the mean of its divisors is an integer number (6102006888).

Almost surely, 2^21357024101 is an apocalyptic number.

It is an amenable number.

21357024101 is a deficient number, since it is larger than the sum of its proper divisors (3051003451).

21357024101 is an equidigital number, since it uses as much as digits as its factorization.

21357024101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3051003450.

The product of its (nonzero) digits is 1680, while the sum is 26.

Adding to 21357024101 its reverse (10142075312), we get a palindrome (31499099413).

The spelling of 21357024101 in words is "twenty-one billion, three hundred fifty-seven million, twenty-four thousand, one hundred one".