21013102011 has 16 divisors (see below), whose sum is σ = 30701583360. Its totient is φ = 12678100320.

The previous prime is 21013101983. The next prime is 21013102027. The reversal of 21013102011 is 11020131012.

It is not a de Polignac number, because 21013102011 - 2⁵ = 21013101979 is a prime.

It is a super-2 number, since 2×21013102011² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21013102081) 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, 1420356 + ... + 1435073.

It is an arithmetic number, because the mean of its divisors is an integer number (1918848960).

Almost surely, 2^21013102011 is an apocalyptic number.

21013102011 is a deficient number, since it is larger than the sum of its proper divisors (9688481349).

21013102011 is a wasteful number, since it uses less digits than its factorization.

21013102011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2855666.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21013102011 its reverse (11020131012), we get a palindrome (32033233023).

The spelling of 21013102011 in words is "twenty-one billion, thirteen million, one hundred two thousand, eleven".