21012211010 has 128 divisors (see below), whose sum is σ = 45013985280. Its totient is φ = 6913299456.

The previous prime is 21012211009. The next prime is 21012211049. The reversal of 21012211010 is 1011221012.

It is a junction number, because it is equal to n+sod(n) for n = 21012210982 and 21012211000.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 55441001 + ... + 55441379.

It is an arithmetic number, because the mean of its divisors is an integer number (351671760).

Almost surely, 2^21012211010 is an apocalyptic number.

21012211010 is an abundant number, since it is smaller than the sum of its proper divisors (24001774270).

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

21012211010 is a wasteful number, since it uses less digits than its factorization.

21012211010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712.

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

Adding to 21012211010 its reverse (1011221012), we get a palindrome (22023432022).

The spelling of 21012211010 in words is "twenty-one billion, twelve million, two hundred eleven thousand, ten".