21366420150331 has 4 divisors (see below), whose sum is σ = 21375912120664. Its totient is φ = 21356928180000.

The previous prime is 21366420150323. The next prime is 21366420150353. The reversal of 21366420150331 is 13305102466312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21366420150331 - 2³ = 21366420150323 is a prime.

It is a super-2 number, since 2×21366420150331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21366420100331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4745981790 + ... + 4745986291.

It is an arithmetic number, because the mean of its divisors is an integer number (5343978030166).

Almost surely, 2^{21366420150331} is an apocalyptic number.

21366420150331 is a deficient number, since it is larger than the sum of its proper divisors (9491970333).

21366420150331 is an equidigital number, since it uses as much as digits as its factorization.

21366420150331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9491970332.

The product of its (nonzero) digits is 77760, while the sum is 37.

The spelling of 21366420150331 in words is "twenty-one trillion, three hundred sixty-six billion, four hundred twenty million, one hundred fifty thousand, three hundred thirty-one".