21011222046 has 16 divisors (see below), whose sum is σ = 44494352784. Its totient is φ = 6591755904.

The previous prime is 21011221997. The next prime is 21011222047. The reversal of 21011222046 is 64022211012.

It is a super-2 number, since 2×21011222046² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011222047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102996085 + ... + 102996288.

It is an arithmetic number, because the mean of its divisors is an integer number (2780897049).

Almost surely, 2^21011222046 is an apocalyptic number.

21011222046 is an abundant number, since it is smaller than the sum of its proper divisors (23483130738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21011222046 is a wasteful number, since it uses less digits than its factorization.

21011222046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205992395.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21011222046 its reverse (64022211012), we get a palindrome (85033433058).

The spelling of 21011222046 in words is "twenty-one billion, eleven million, two hundred twenty-two thousand, forty-six".