210221220202109 has 16 divisors (see below), whose sum is σ = 222869076472320. Its totient is φ = 197940100438080.

The previous prime is 210221220202069. The next prime is 210221220202111. The reversal of 210221220202109 is 901202022122012.

It is a cyclic number.

It is not a de Polignac number, because 210221220202109 - 2¹² = 210221220198013 is a prime.

It is a super-2 number, since 2×210221220202109² (a number of 29 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 (210221220702109) 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, 182133782 + ... + 183284360.

It is an arithmetic number, because the mean of its divisors is an integer number (13929317279520).

Almost surely, 2^{210221220202109} is an apocalyptic number.

It is an amenable number.

210221220202109 is a deficient number, since it is larger than the sum of its proper divisors (12647856270211).

210221220202109 is a wasteful number, since it uses less digits than its factorization.

210221220202109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309940.

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 210221220202109 in words is "two hundred ten trillion, two hundred twenty-one billion, two hundred twenty million, two hundred two thousand, one hundred nine".