21121301753 has 8 divisors (see below), whose sum is σ = 21582847872. Its totient is φ = 20660262256.

The previous prime is 21121301743. The next prime is 21121301771. The reversal of 21121301753 is 35710312112.

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

It is not a de Polignac number, because 21121301753 - 2¹⁸ = 21121039609 is a prime.

It is a super-2 number, since 2×21121301753² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121301713) 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 7 ways as a sum of consecutive naturals, for example, 41750 + ... + 209727.

It is an arithmetic number, because the mean of its divisors is an integer number (2697855984).

Almost surely, 2^21121301753 is an apocalyptic number.

It is an amenable number.

21121301753 is a deficient number, since it is larger than the sum of its proper divisors (461546119).

21121301753 is a wasteful number, since it uses less digits than its factorization.

21121301753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253311.

The product of its (nonzero) digits is 1260, while the sum is 26.

Adding to 21121301753 its reverse (35710312112), we get a palindrome (56831613865).

The spelling of 21121301753 in words is "twenty-one billion, one hundred twenty-one million, three hundred one thousand, seven hundred fifty-three".