20910121210 has 32 divisors (see below), whose sum is σ = 43475164992. Its totient is φ = 7156404480.

The previous prime is 20910121201. The next prime is 20910121229. The reversal of 20910121210 is 1212101902.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5589072 + ... + 5592811.

It is an arithmetic number, because the mean of its divisors is an integer number (1358598906).

Almost surely, 2^20910121210 is an apocalyptic number.

20910121210 is an abundant number, since it is smaller than the sum of its proper divisors (22565043782).

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

20910121210 is a wasteful number, since it uses less digits than its factorization.

20910121210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11181918.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 20910121210 in words is "twenty billion, nine hundred ten million, one hundred twenty-one thousand, two hundred ten".