21400134521051 has 16 divisors (see below), whose sum is σ = 26464649245440. Its totient is φ = 17012988796320.

The previous prime is 21400134521009. The next prime is 21400134521053. The reversal of 21400134521051 is 15012543100412.

It is a happy number.

It is not a de Polignac number, because 21400134521051 - 2⁴² = 17002088009947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21400134521053) 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, 3938189135 + ... + 3938194568.

It is an arithmetic number, because the mean of its divisors is an integer number (1654040577840).

Almost surely, 2^{21400134521051} is an apocalyptic number.

21400134521051 is a deficient number, since it is larger than the sum of its proper divisors (5064514724389).

21400134521051 is a wasteful number, since it uses less digits than its factorization.

21400134521051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7876383746.

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 21400134521051 its reverse (15012543100412), we get a palindrome (36412677621463).

The spelling of 21400134521051 in words is "twenty-one trillion, four hundred billion, one hundred thirty-four million, five hundred twenty-one thousand, fifty-one".