21400822206742 has 16 divisors (see below), whose sum is σ = 35019870354432. Its totient is φ = 9727551150120.

The previous prime is 21400822206737. The next prime is 21400822206761. The reversal of 21400822206742 is 24760222800412.

It is a super-2 number, since 2×21400822206742² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21400822206695 and 21400822206704.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2443758 + ... + 6983809.

It is an arithmetic number, because the mean of its divisors is an integer number (2188741897152).

Almost surely, 2^{21400822206742} is an apocalyptic number.

21400822206742 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21400822206742 is a deficient number, since it is larger than the sum of its proper divisors (13619048147690).

21400822206742 is a wasteful number, since it uses less digits than its factorization.

21400822206742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9530763.

The product of its (nonzero) digits is 172032, while the sum is 40.

The spelling of 21400822206742 in words is "twenty-one trillion, four hundred billion, eight hundred twenty-two million, two hundred six thousand, seven hundred forty-two".