21501041405451 has 16 divisors (see below), whose sum is σ = 30034515237888. Its totient is φ = 13664600215200.

The previous prime is 21501041405419. The next prime is 21501041405471. The reversal of 21501041405451 is 15450414010512.

It is not a de Polignac number, because 21501041405451 - 2⁵ = 21501041405419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21501041405471) 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, 1725322080 + ... + 1725334541.

It is an arithmetic number, because the mean of its divisors is an integer number (1877157202368).

Almost surely, 2^{21501041405451} is an apocalyptic number.

21501041405451 is a deficient number, since it is larger than the sum of its proper divisors (8533473832437).

21501041405451 is a wasteful number, since it uses less digits than its factorization.

21501041405451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3450656722.

The product of its (nonzero) digits is 16000, while the sum is 33.

Adding to 21501041405451 its reverse (15450414010512), we get a palindrome (36951455415963).

The spelling of 21501041405451 in words is "twenty-one trillion, five hundred one billion, forty-one million, four hundred five thousand, four hundred fifty-one".