21202143015 has 32 divisors (see below), whose sum is σ = 35978697216. Its totient is φ = 10638840960.

The previous prime is 21202142989. The next prime is 21202143019. The reversal of 21202143015 is 51034120212.

It is a de Polignac number, because none of the positive numbers 2^k-21202143015 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21202142982 and 21202143000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202143019) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 482689 + ... + 524778.

It is an arithmetic number, because the mean of its divisors is an integer number (1124334288).

Almost surely, 2^21202143015 is an apocalyptic number.

21202143015 is a deficient number, since it is larger than the sum of its proper divisors (14776554201).

21202143015 is a wasteful number, since it uses less digits than its factorization.

21202143015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007559.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21202143015 its reverse (51034120212), we get a palindrome (72236263227).

The spelling of 21202143015 in words is "twenty-one billion, two hundred two million, one hundred forty-three thousand, fifteen".