21053760816121 has 16 divisors (see below), whose sum is σ = 23017691592000. Its totient is φ = 19098166225600.

The previous prime is 21053760816119. The next prime is 21053760816131. The reversal of 21053760816121 is 12161806735012.

It is not a de Polignac number, because 21053760816121 - 2¹ = 21053760816119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21053760816131) 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, 39426735 + ... + 39957163.

It is an arithmetic number, because the mean of its divisors is an integer number (1438605724500).

Almost surely, 2^{21053760816121} is an apocalyptic number.

It is an amenable number.

21053760816121 is a deficient number, since it is larger than the sum of its proper divisors (1963930775879).

21053760816121 is a wasteful number, since it uses less digits than its factorization.

21053760816121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538280.

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 21053760816121 in words is "twenty-one trillion, fifty-three billion, seven hundred sixty million, eight hundred sixteen thousand, one hundred twenty-one".