21034214121 has 16 divisors (see below), whose sum is σ = 29701219968. Its totient is φ = 13195334400.

The previous prime is 21034214093. The next prime is 21034214129. The reversal of 21034214121 is 12141243012.

It is not a de Polignac number, because 21034214121 - 2¹⁸ = 21033951977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21034214129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 239011 + ... + 314951.

It is an arithmetic number, because the mean of its divisors is an integer number (1856326248).

Almost surely, 2^21034214121 is an apocalyptic number.

It is an amenable number.

21034214121 is a deficient number, since it is larger than the sum of its proper divisors (8667005847).

21034214121 is a wasteful number, since it uses less digits than its factorization.

21034214121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81392.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21034214121 its reverse (12141243012), we get a palindrome (33175457133).

The spelling of 21034214121 in words is "twenty-one billion, thirty-four million, two hundred fourteen thousand, one hundred twenty-one".