21374400422121 has 16 divisors (see below), whose sum is σ = 28547755135680. Its totient is φ = 14225343275520.

The previous prime is 21374400422117. The next prime is 21374400422161. The reversal of 21374400422121 is 12122400447312.

It is not a de Polignac number, because 21374400422121 - 2² = 21374400422117 is a prime.

It is a super-2 number, since 2×21374400422121² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21374400422161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1683870 + ... + 6751608.

It is an arithmetic number, because the mean of its divisors is an integer number (1784234695980).

Almost surely, 2^{21374400422121} is an apocalyptic number.

It is an amenable number.

21374400422121 is a deficient number, since it is larger than the sum of its proper divisors (7173354713559).

21374400422121 is a wasteful number, since it uses less digits than its factorization.

21374400422121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5070136.

The product of its (nonzero) digits is 21504, while the sum is 33.

Adding to 21374400422121 its reverse (12122400447312), we get a palindrome (33496800869433).

The spelling of 21374400422121 in words is "twenty-one trillion, three hundred seventy-four billion, four hundred million, four hundred twenty-two thousand, one hundred twenty-one".