21111211010 has 8 divisors (see below), whose sum is σ = 38000179836. Its totient is φ = 8444484400.

The previous prime is 21111211003. The next prime is 21111211013. The reversal of 21111211010 is 1011211112.

It can be written as a sum of positive squares in 2 ways, for example, as 19904412889 + 1206798121 = 141083^2 + 34739^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21111210982 and 21111211000.

It is not an unprimeable number, because it can be changed into a prime (21111211013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1055560541 + ... + 1055560560.

Almost surely, 2^21111211010 is an apocalyptic number.

21111211010 is a deficient number, since it is larger than the sum of its proper divisors (16888968826).

21111211010 is a wasteful number, since it uses less digits than its factorization.

21111211010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111121108.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21111211010 its reverse (1011211112), we get a palindrome (22122422122).

It can be divided in two parts, 2111 and 1211010, that added together give a palindrome (1213121).

The spelling of 21111211010 in words is "twenty-one billion, one hundred eleven million, two hundred eleven thousand, ten".