21252202156 has 12 divisors (see below), whose sum is σ = 37193220792. Its totient is φ = 10625567648.

The previous prime is 21252202151. The next prime is 21252202159. The reversal of 21252202156 is 65120225212.

It is not an unprimeable number, because it can be changed into a prime (21252202151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35785 + ... + 209248.

It is an arithmetic number, because the mean of its divisors is an integer number (3099435066).

Almost surely, 2^21252202156 is an apocalyptic number.

It is an amenable number.

21252202156 is a deficient number, since it is larger than the sum of its proper divisors (15941018636).

21252202156 is a wasteful number, since it uses less digits than its factorization.

21252202156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266720 (or 266718 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 21252202156 its reverse (65120225212), we get a palindrome (86372427368).

The spelling of 21252202156 in words is "twenty-one billion, two hundred fifty-two million, two hundred two thousand, one hundred fifty-six".