21002121001010 has 32 divisors (see below), whose sum is σ = 37814345616240. Its totient is φ = 8398509251328.

The previous prime is 21002121000983. The next prime is 21002121001019. The reversal of 21002121001010 is 1010012120012.

It can be written as a sum of positive squares in 8 ways, for example, as 10778095566001 + 10224025435009 = 3283001^2 + 3197503^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21002121000982 and 21002121001000.

It is not an unprimeable number, because it can be changed into a prime (21002121001019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 786789224 + ... + 786815916.

Almost surely, 2^{21002121001010} is an apocalyptic number.

21002121001010 is a deficient number, since it is larger than the sum of its proper divisors (16812224615230).

21002121001010 is a wasteful number, since it uses less digits than its factorization.

21002121001010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45662.

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

Adding to 21002121001010 its reverse (1010012120012), we get a palindrome (22012133121022).

The spelling of 21002121001010 in words is "twenty-one trillion, two billion, one hundred twenty-one million, one thousand, ten".