21012011210 has 32 divisors (see below), whose sum is σ = 38391777792. Its totient is φ = 8278416000.

The previous prime is 21012011191. The next prime is 21012011221. The reversal of 21012011210 is 1211021012.

It is a junction number, because it is equal to n+sod(n) for n = 21012011191 and 21012011200.

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, 529067 + ... + 567393.

It is an arithmetic number, because the mean of its divisors is an integer number (1199743056).

Almost surely, 2^21012011210 is an apocalyptic number.

21012011210 is a deficient number, since it is larger than the sum of its proper divisors (17379766582).

21012011210 is a wasteful number, since it uses less digits than its factorization.

21012011210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39158.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21012011210 its reverse (1211021012), we get a palindrome (22223032222).

The spelling of 21012011210 in words is "twenty-one billion, twelve million, eleven thousand, two hundred ten".