21210200009961 has 16 divisors (see below), whose sum is σ = 28335578537088. Its totient is φ = 14112479388800.

The previous prime is 21210200009959. The next prime is 21210200010011. The reversal of 21210200009961 is 16990000201212.

It is a cyclic number.

It is not a de Polignac number, because 21210200009961 - 2¹ = 21210200009959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21210200009261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45418231 + ... + 45882851.

It is an arithmetic number, because the mean of its divisors is an integer number (1770973658568).

Almost surely, 2^{21210200009961} is an apocalyptic number.

It is an amenable number.

21210200009961 is a deficient number, since it is larger than the sum of its proper divisors (7125378527127).

21210200009961 is a wasteful number, since it uses less digits than its factorization.

21210200009961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494352.

The product of its (nonzero) digits is 3888, while the sum is 33.

The spelling of 21210200009961 in words is "twenty-one trillion, two hundred ten billion, two hundred million, nine thousand, nine hundred sixty-one".