21001420323422 has 16 divisors (see below), whose sum is σ = 39275383462272. Its totient is φ = 8182371554520.

The previous prime is 21001420323407. The next prime is 21001420323461. The reversal of 21001420323422 is 22432302410012.

It is a junction number, because it is equal to n+sod(n) for n = 21001420323391 and 21001420323400.

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, 68186429468 + ... + 68186429775.

It is an arithmetic number, because the mean of its divisors is an integer number (2454711466392).

Almost surely, 2^{21001420323422} is an apocalyptic number.

21001420323422 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21001420323422 is a deficient number, since it is larger than the sum of its proper divisors (18273963138850).

21001420323422 is a wasteful number, since it uses less digits than its factorization.

21001420323422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136372859263.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21001420323422 its reverse (22432302410012), we get a palindrome (43433722733434).

The spelling of 21001420323422 in words is "twenty-one trillion, one billion, four hundred twenty million, three hundred twenty-three thousand, four hundred twenty-two".