21210510770000 has 50 divisors (see below), whose sum is σ = 51352767649458. Its totient is φ = 8484204304000.

The previous prime is 21210510769993. The next prime is 21210510770011. The reversal of 21210510770000 is 7701501212.

It can be written as a sum of positive squares in 5 ways, for example, as 6703583800384 + 14506926969616 = 2589128^2 + 3808796^2 .

It is a tau number, because it is divible by the number of its divisors (50).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1060515539 + ... + 1060535538.

Almost surely, 2^{21210510770000} is an apocalyptic number.

21210510770000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210510770000 is an abundant number, since it is smaller than the sum of its proper divisors (30142256879458).

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

21210510770000 is an equidigital number, since it uses as much as digits as its factorization.

21210510770000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121051105 (or 2121051084 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 26.

The spelling of 21210510770000 in words is "twenty-one trillion, two hundred ten billion, five hundred ten million, seven hundred seventy thousand".