21154005400051 has 16 divisors (see below), whose sum is σ = 21477189333600. Its totient is φ = 20833934577408.

The previous prime is 21154005399929. The next prime is 21154005400067. The reversal of 21154005400051 is 15000450045112.

It is a cyclic number.

It is not a de Polignac number, because 21154005400051 - 2¹³ = 21154005391859 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21154005399992 and 21154005400019.

It is not an unprimeable number, because it can be changed into a prime (21154005400091) 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, 7498045 + ... + 9926161.

It is an arithmetic number, because the mean of its divisors is an integer number (1342324333350).

Almost surely, 2^{21154005400051} is an apocalyptic number.

21154005400051 is a deficient number, since it is larger than the sum of its proper divisors (323183933549).

21154005400051 is a wasteful number, since it uses less digits than its factorization.

21154005400051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2428758.

The product of its (nonzero) digits is 4000, while the sum is 28.

Adding to 21154005400051 its reverse (15000450045112), we get a palindrome (36154455445163).

The spelling of 21154005400051 in words is "twenty-one trillion, one hundred fifty-four billion, five million, four hundred thousand, fifty-one".