21146531240436 has 48 divisors (see below), whose sum is σ = 59358684188160. Its totient is φ = 5723873117280.

The previous prime is 21146531240369. The next prime is 21146531240437. The reversal of 21146531240436 is 63404213564112.

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 (21146531240437) 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, 6624851550 + ... + 6624854741.

It is an arithmetic number, because the mean of its divisors is an integer number (1236639253920).

Almost surely, 2^{21146531240436} is an apocalyptic number.

It is an amenable number.

21146531240436 is an abundant number, since it is smaller than the sum of its proper divisors (38212152947724).

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

21146531240436 is a wasteful number, since it uses less digits than its factorization.

21146531240436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13249706324 (or 13249706322 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 21146531240436 in words is "twenty-one trillion, one hundred forty-six billion, five hundred thirty-one million, two hundred forty thousand, four hundred thirty-six".