21201422342121 has 80 divisors (see below), whose sum is σ = 38447335897344. Its totient is φ = 11366014473216.

The previous prime is 21201422342099. The next prime is 21201422342129. The reversal of 21201422342121 is 12124322410212.

21201422342121 is a `hidden beast` number, since 2 + 1 + 2 + 0 + 14 + 223 + 421 + 2 + 1 = 666.

It is not a de Polignac number, because 21201422342121 - 2¹⁰ = 21201422341097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 79 ways as a sum of consecutive naturals, for example, 496645 + ... + 6530658.

Almost surely, 2^{21201422342121} is an apocalyptic number.

21201422342121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21201422342121 is a deficient number, since it is larger than the sum of its proper divisors (17245913555223).

21201422342121 is a wasteful number, since it uses less digits than its factorization.

21201422342121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7027652 (or 7027643 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

Adding to 21201422342121 its reverse (12124322410212), we get a palindrome (33325744752333).

The spelling of 21201422342121 in words is "twenty-one trillion, two hundred one billion, four hundred twenty-two million, three hundred forty-two thousand, one hundred twenty-one".