21020211010 has 16 divisors (see below), whose sum is σ = 38369287872. Its totient is φ = 8289660400.

The previous prime is 21020210963. The next prime is 21020211011. The reversal of 21020211010 is 1011202012.

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 (21020211011) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 14802256 + ... + 14803675.

It is an arithmetic number, because the mean of its divisors is an integer number (2398080492).

Almost surely, 2^21020211010 is an apocalyptic number.

21020211010 is a deficient number, since it is larger than the sum of its proper divisors (17349076862).

21020211010 is a wasteful number, since it uses less digits than its factorization.

21020211010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29606009.

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

Adding to 21020211010 its reverse (1011202012), we get a palindrome (22031413022).

The spelling of 21020211010 in words is "twenty-one billion, twenty million, two hundred eleven thousand, ten".