21621265773053 has 8 divisors (see below), whose sum is σ = 22879085890176. Its totient is φ = 20389926079600.

The previous prime is 21621265773013. The next prime is 21621265773067. The reversal of 21621265773053 is 35037756212612.

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

It is not a de Polignac number, because 21621265773053 - 2¹⁸ = 21621265510909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21621265772992 and 21621265773010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21621265773013) 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, 6620104238 + ... + 6620107503.

It is an arithmetic number, because the mean of its divisors is an integer number (2859885736272).

Almost surely, 2^{21621265773053} is an apocalyptic number.

21621265773053 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21621265773053 is a deficient number, since it is larger than the sum of its proper divisors (1257820117123).

21621265773053 is a wasteful number, since it uses less digits than its factorization.

21621265773053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13240211835.

The product of its (nonzero) digits is 3175200, while the sum is 50.

The spelling of 21621265773053 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred sixty-five million, seven hundred seventy-three thousand, fifty-three".