21535340131002 has 16 divisors (see below), whose sum is σ = 43238270460672. Its totient is φ = 7150515010560.

The previous prime is 21535340130947. The next prime is 21535340131051. The reversal of 21535340131002 is 20013104353512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6982923274 + ... + 6982926357.

It is an arithmetic number, because the mean of its divisors is an integer number (2702391903792).

Almost surely, 2^{21535340131002} is an apocalyptic number.

21535340131002 is an abundant number, since it is smaller than the sum of its proper divisors (21702930329670).

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

21535340131002 is a wasteful number, since it uses less digits than its factorization.

21535340131002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13965849893.

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 21535340131002 its reverse (20013104353512), we get a palindrome (41548444484514).

The spelling of 21535340131002 in words is "twenty-one trillion, five hundred thirty-five billion, three hundred forty million, one hundred thirty-one thousand, two".