21015403011 has 12 divisors (see below), whose sum is σ = 30369657240. Its totient is φ = 14003772480.

The previous prime is 21015403007. The next prime is 21015403027. The reversal of 21015403011 is 11030451012.

21015403011 is a `hidden beast` number, since 210 + 154 + 0 + 301 + 1 = 666.

It is not a de Polignac number, because 21015403011 - 2² = 21015403007 is a prime.

It is a super-2 number, since 2×21015403011² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21015403061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 520821 + ... + 559718.

It is an arithmetic number, because the mean of its divisors is an integer number (2530804770).

Almost surely, 2^21015403011 is an apocalyptic number.

21015403011 is a deficient number, since it is larger than the sum of its proper divisors (9354254229).

21015403011 is a wasteful number, since it uses less digits than its factorization.

21015403011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082706 (or 1082703 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 21015403011 its reverse (11030451012), we get a palindrome (32045854023).

The spelling of 21015403011 in words is "twenty-one billion, fifteen million, four hundred three thousand, eleven".