21111210100010 has 16 divisors (see below), whose sum is σ = 38000309749416. Its totient is φ = 8444454802368.

The previous prime is 21111210099971. The next prime is 21111210100037. The reversal of 21111210100010 is 1000101211112.

It can be written as a sum of positive squares in 4 ways, for example, as 10572700961761 + 10538509138249 = 3251569^2 + 3246307^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21111210099964 and 21111210100000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 491717 + ... + 6516456.

Almost surely, 2^{21111210100010} is an apocalyptic number.

21111210100010 is a deficient number, since it is larger than the sum of its proper divisors (16889099649406).

21111210100010 is a wasteful number, since it uses less digits than its factorization.

21111210100010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7309417.

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

Adding to 21111210100010 its reverse (1000101211112), we get a palindrome (22111311311122).

The spelling of 21111210100010 in words is "twenty-one trillion, one hundred eleven billion, two hundred ten million, one hundred thousand, ten".