210217137210820 has 96 divisors (see below), whose sum is σ = 445913233920000. Its totient is φ = 83242502267904.

The previous prime is 210217137210793. The next prime is 210217137210841. The reversal of 210217137210820 is 28012731712012.

It is a super-2 number, since 2×210217137210820² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 210217137210820.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1756301536 + ... + 1756421224.

It is an arithmetic number, because the mean of its divisors is an integer number (4644929520000).

Almost surely, 2^{210217137210820} is an apocalyptic number.

210217137210820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210217137210820 is an abundant number, since it is smaller than the sum of its proper divisors (235696096709180).

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

210217137210820 is a wasteful number, since it uses less digits than its factorization.

210217137210820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122117 (or 122115 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 37.

Adding to 210217137210820 its reverse (28012731712012), we get a palindrome (238229868922832).

The spelling of 210217137210820 in words is "two hundred ten trillion, two hundred seventeen billion, one hundred thirty-seven million, two hundred ten thousand, eight hundred twenty".