21355420332620 has 24 divisors (see below), whose sum is σ = 48923326580688. Its totient is φ = 7765607393600.

The previous prime is 21355420332601. The next prime is 21355420332683. The reversal of 21355420332620 is 2623302455312.

It is a super-2 number, since 2×21355420332620² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48535045991 + ... + 48535046430.

It is an arithmetic number, because the mean of its divisors is an integer number (2038471940862).

Almost surely, 2^{21355420332620} is an apocalyptic number.

21355420332620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21355420332620 is an abundant number, since it is smaller than the sum of its proper divisors (27567906248068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21355420332620 is a wasteful number, since it uses less digits than its factorization.

21355420332620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97070092441 (or 97070092439 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 38.

Adding to 21355420332620 its reverse (2623302455312), we get a palindrome (23978722787932).

The spelling of 21355420332620 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred twenty million, three hundred thirty-two thousand, six hundred twenty".