21030101311 has 4 divisors (see below), whose sum is σ = 22267166112. Its totient is φ = 19793036512.

The previous prime is 21030101291. The next prime is 21030101317. The reversal of 21030101311 is 11310103012.

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 21030101311 - 2³³ = 12440166719 is a prime.

It is a super-2 number, since 2×21030101311² (a number of 21 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 = 21030101291 and 21030101300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030101317) 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, 618532375 + ... + 618532408.

It is an arithmetic number, because the mean of its divisors is an integer number (5566791528).

Almost surely, 2^21030101311 is an apocalyptic number.

21030101311 is a deficient number, since it is larger than the sum of its proper divisors (1237064801).

21030101311 is a wasteful number, since it uses less digits than its factorization.

21030101311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237064800.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 21030101311 its reverse (11310103012), we get a palindrome (32340204323).

The spelling of 21030101311 in words is "twenty-one billion, thirty million, one hundred one thousand, three hundred eleven".