10206420653621 has 4 divisors (see below), whose sum is σ = 10265417304972. Its totient is φ = 10147424002272.

The previous prime is 10206420653521. The next prime is 10206420653623. The reversal of 10206420653621 is 12635602460201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6136965744100 + 4069454909521 = 2477290^2 + 2017289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10206420653621 is a prime.

It is a super-2 number, since 2×10206420653621² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10206420653623) 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, 29498325416 + ... + 29498325761.

It is an arithmetic number, because the mean of its divisors is an integer number (2566354326243).

Almost surely, 2^{10206420653621} is an apocalyptic number.

It is an amenable number.

10206420653621 is a deficient number, since it is larger than the sum of its proper divisors (58996651351).

10206420653621 is an equidigital number, since it uses as much as digits as its factorization.

10206420653621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58996651350.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 10206420653621 in words is "ten trillion, two hundred six billion, four hundred twenty million, six hundred fifty-three thousand, six hundred twenty-one".