21101212233442 has 64 divisors (see below), whose sum is σ = 35839556628480. Its totient is φ = 9233964230400.

The previous prime is 21101212233419. The next prime is 21101212233443. The reversal of 21101212233442 is 24433221210112.

It is a super-2 number, since 2×21101212233442² (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 21101212233442.

It is not an unprimeable number, because it can be changed into a prime (21101212233443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 261168183 + ... + 261248965.

It is an arithmetic number, because the mean of its divisors is an integer number (559993072320).

Almost surely, 2^{21101212233442} is an apocalyptic number.

21101212233442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21101212233442 is a deficient number, since it is larger than the sum of its proper divisors (14738344395038).

21101212233442 is a wasteful number, since it uses less digits than its factorization.

21101212233442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84799.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 21101212233442 its reverse (24433221210112), we get a palindrome (45534433443554).

The spelling of 21101212233442 in words is "twenty-one trillion, one hundred one billion, two hundred twelve million, two hundred thirty-three thousand, four hundred forty-two".