21255354123202 has 16 divisors (see below), whose sum is σ = 32434351518240. Its totient is φ = 10445230501632.

The previous prime is 21255354123193. The next prime is 21255354123257. The reversal of 21255354123202 is 20232145355212.

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, 331688952 + ... + 331753027.

It is an arithmetic number, because the mean of its divisors is an integer number (2027146969890).

Almost surely, 2^{21255354123202} is an apocalyptic number.

21255354123202 is a deficient number, since it is larger than the sum of its proper divisors (11178997395038).

21255354123202 is a wasteful number, since it uses less digits than its factorization.

21255354123202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663442257.

The product of its (nonzero) digits is 144000, while the sum is 37.

Adding to 21255354123202 its reverse (20232145355212), we get a palindrome (41487499478414).

The spelling of 21255354123202 in words is "twenty-one trillion, two hundred fifty-five billion, three hundred fifty-four million, one hundred twenty-three thousand, two hundred two".