20211521106 has 32 divisors (see below), whose sum is σ = 46481200128. Its totient is φ = 5739290640.

The previous prime is 20211521053. The next prime is 20211521117. The reversal of 20211521106 is 60112511202.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1469310 + ... + 1483001.

It is an arithmetic number, because the mean of its divisors is an integer number (1452537504).

Almost surely, 2^20211521106 is an apocalyptic number.

20211521106 is an abundant number, since it is smaller than the sum of its proper divisors (26269679022).

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

20211521106 is a wasteful number, since it uses less digits than its factorization.

20211521106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2952486.

The product of its (nonzero) digits is 240, while the sum is 21.

The spelling of 20211521106 in words is "twenty billion, two hundred eleven million, five hundred twenty-one thousand, one hundred six".