21202010021011 has 4 divisors (see below), whose sum is σ = 21280827902400. Its totient is φ = 21123192139624.

The previous prime is 21202010020963. The next prime is 21202010021057. The reversal of 21202010021011 is 11012001020212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21202010021011 - 2²³ = 21202001632403 is a prime.

It is a super-2 number, since 2×21202010021011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21202010020982 and 21202010021000.

It is not an unprimeable number, because it can be changed into a prime (21202010031011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39408940291 + ... + 39408940828.

It is an arithmetic number, because the mean of its divisors is an integer number (5320206975600).

Almost surely, 2^{21202010021011} is an apocalyptic number.

21202010021011 is a deficient number, since it is larger than the sum of its proper divisors (78817881389).

21202010021011 is an equidigital number, since it uses as much as digits as its factorization.

21202010021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78817881388.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21202010021011 its reverse (11012001020212), we get a palindrome (32214011041223).

The spelling of 21202010021011 in words is "twenty-one trillion, two hundred two billion, ten million, twenty-one thousand, eleven".