21077200812021 has 4 divisors (see below), whose sum is σ = 28102934416032. Its totient is φ = 14051467208012.

The previous prime is 21077200811917. The next prime is 21077200812023. The reversal of 21077200812021 is 12021800277012.

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 21077200812021 - 2¹⁸ = 21077200549877 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21077200812023) 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, 3512866802001 + ... + 3512866802006.

It is an arithmetic number, because the mean of its divisors is an integer number (7025733604008).

Almost surely, 2^{21077200812021} is an apocalyptic number.

It is an amenable number.

21077200812021 is a deficient number, since it is larger than the sum of its proper divisors (7025733604011).

21077200812021 is an equidigital number, since it uses as much as digits as its factorization.

21077200812021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7025733604010.

The product of its (nonzero) digits is 6272, while the sum is 33.

The spelling of 21077200812021 in words is "twenty-one trillion, seventy-seven billion, two hundred million, eight hundred twelve thousand, twenty-one".