21620546206356 has 48 divisors (see below), whose sum is σ = 53421858431424. Its totient is φ = 6782104859136.

The previous prime is 21620546206313. The next prime is 21620546206367. The reversal of 21620546206356 is 65360264502612.

It is a super-2 number, since 2×21620546206356² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4630375 + ... + 8042478.

It is an arithmetic number, because the mean of its divisors is an integer number (1112955383988).

Almost surely, 2^{21620546206356} is an apocalyptic number.

It is an amenable number.

21620546206356 is an abundant number, since it is smaller than the sum of its proper divisors (31801312225068).

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

21620546206356 is a wasteful number, since it uses less digits than its factorization.

21620546206356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12681240 (or 12681238 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 48.

The spelling of 21620546206356 in words is "twenty-one trillion, six hundred twenty billion, five hundred forty-six million, two hundred six thousand, three hundred fifty-six".