21451533515412 has 96 divisors (see below), whose sum is σ = 67204804337664. Its totient is φ = 5143224816000.

The previous prime is 21451533515411. The next prime is 21451533515471.

21451533515412 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21451533515411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 892908964 + ... + 892932987.

It is an arithmetic number, because the mean of its divisors is an integer number (700050045184).

Almost surely, 2^{21451533515412} is an apocalyptic number.

21451533515412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21451533515412 is an abundant number, since it is smaller than the sum of its proper divisors (45753270822252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21451533515412 is a wasteful number, since it uses less digits than its factorization.

21451533515412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785841989 (or 1785841987 counting only the distinct ones).

The product of its digits is 360000, while the sum is 42.

The spelling of 21451533515412 in words is "twenty-one trillion, four hundred fifty-one billion, five hundred thirty-three million, five hundred fifteen thousand, four hundred twelve".