21121000000210 has 32 divisors (see below), whose sum is σ = 41816723693184. Its totient is φ = 7680363631600.

The previous prime is 21121000000151. The next prime is 21121000000213. The reversal of 21121000000210 is 1200000012112.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21121000000213) 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, 793412686 + ... + 793439305.

It is an arithmetic number, because the mean of its divisors is an integer number (1306772615412).

Almost surely, 2^{21121000000210} is an apocalyptic number.

21121000000210 is a deficient number, since it is larger than the sum of its proper divisors (20695723692974).

21121000000210 is a wasteful number, since it uses less digits than its factorization.

21121000000210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1586852031 (or 1586852009 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21121000000210 its reverse (1200000012112), we get a palindrome (22321000012322).

The spelling of 21121000000210 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred ten", and thus it is an aban number.