21002111011010 has 8 divisors (see below), whose sum is σ = 37803799819836. Its totient is φ = 8400844404400.

The previous prime is 21002111010997. The next prime is 21002111011043. The reversal of 21002111011010 is 1011011120012.

It can be written as a sum of positive squares in 2 ways, for example, as 19573395217489 + 1428715793521 = 4424183^2 + 1195289^2 .

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 = 21002111010982 and 21002111011000.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050105550541 + ... + 1050105550560.

Almost surely, 2^{21002111011010} is an apocalyptic number.

21002111011010 is a deficient number, since it is larger than the sum of its proper divisors (16801688808826).

21002111011010 is a wasteful number, since it uses less digits than its factorization.

21002111011010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100211101108.

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

Adding to 21002111011010 its reverse (1011011120012), we get a palindrome (22013122131022).

The spelling of 21002111011010 in words is "twenty-one trillion, two billion, one hundred eleven million, eleven thousand, ten".