21507532021162 has 48 divisors (see below), whose sum is σ = 35767207437696. Its totient is φ = 9691858440000.

The previous prime is 21507532021133. The next prime is 21507532021163. The reversal of 21507532021162 is 26112023570512.

It is not an unprimeable number, because it can be changed into a prime (21507532021163) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24466753 + ... + 25330555.

It is an arithmetic number, because the mean of its divisors is an integer number (745150154952).

Almost surely, 2^{21507532021162} is an apocalyptic number.

21507532021162 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21507532021162 is a deficient number, since it is larger than the sum of its proper divisors (14259675416534).

21507532021162 is a wasteful number, since it uses less digits than its factorization.

21507532021162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864715 (or 864704 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

Adding to 21507532021162 its reverse (26112023570512), we get a palindrome (47619555591674).

The spelling of 21507532021162 in words is "twenty-one trillion, five hundred seven billion, five hundred thirty-two million, twenty-one thousand, one hundred sixty-two".