21502031411002 has 4 divisors (see below), whose sum is σ = 32253047116506. Its totient is φ = 10751015705500.

The previous prime is 21502031410991. The next prime is 21502031411017. The reversal of 21502031411002 is 20011413020512.

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

It can be written as a sum of positive squares in only one way, i.e., 15595872603921 + 5906158807081 = 3949161^2 + 2430259^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5375507852749 + ... + 5375507852752.

Almost surely, 2^{21502031411002} is an apocalyptic number.

21502031411002 is a deficient number, since it is larger than the sum of its proper divisors (10751015705504).

21502031411002 is a wasteful number, since it uses less digits than its factorization.

21502031411002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10751015705503.

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 21502031411002 its reverse (20011413020512), we get a palindrome (41513444431514).

The spelling of 21502031411002 in words is "twenty-one trillion, five hundred two billion, thirty-one million, four hundred eleven thousand, two".