21201422342122 has 16 divisors (see below), whose sum is σ = 34693307428032. Its totient is φ = 9636990469920.

The previous prime is 21201422342099. The next prime is 21201422342129. The reversal of 21201422342122 is 22124322410212.

It is not an unprimeable number, because it can be changed into a prime (21201422342129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19554238 + ... + 20609974.

It is an arithmetic number, because the mean of its divisors is an integer number (2168331714252).

Almost surely, 2^{21201422342122} is an apocalyptic number.

21201422342122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21201422342122 is a deficient number, since it is larger than the sum of its proper divisors (13491885085910).

21201422342122 is a wasteful number, since it uses less digits than its factorization.

21201422342122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968573.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 21201422342122 its reverse (22124322410212), we get a palindrome (43325744752334).

The spelling of 21201422342122 in words is "twenty-one trillion, two hundred one billion, four hundred twenty-two million, three hundred forty-two thousand, one hundred twenty-two".