21201111042046 has 16 divisors (see below), whose sum is σ = 34248288612384. Its totient is φ = 9785031028704.

The previous prime is 21201111042029. The next prime is 21201111042073. The reversal of 21201111042046 is 64024011110212.

It is a super-2 number, since 2×21201111042046² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21201111042046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1344346 + ... + 6649021.

It is an arithmetic number, because the mean of its divisors is an integer number (2140518038274).

Almost surely, 2^{21201111042046} is an apocalyptic number.

21201111042046 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21201111042046 is a deficient number, since it is larger than the sum of its proper divisors (13047177570338).

21201111042046 is a wasteful number, since it uses less digits than its factorization.

21201111042046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8095395.

The product of its (nonzero) digits is 768, while the sum is 25.

Adding to 21201111042046 its reverse (64024011110212), we get a palindrome (85225122152258).

The spelling of 21201111042046 in words is "twenty-one trillion, two hundred one billion, one hundred eleven million, forty-two thousand, forty-six".