21502212514450 has 12 divisors (see below), whose sum is σ = 39994115276970. Its totient is φ = 8600885005760.

The previous prime is 21502212514441. The next prime is 21502212514451. The reversal of 21502212514450 is 5441521220512.

It can be written as a sum of positive squares in 3 ways, for example, as 19145376544849 + 2356835969601 = 4375543^2 + 1535199^2 .

It is not an unprimeable number, because it can be changed into a prime (21502212514451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 215022125095 + ... + 215022125194.

Almost surely, 2^{21502212514450} is an apocalyptic number.

21502212514450 is a deficient number, since it is larger than the sum of its proper divisors (18491902762520).

21502212514450 is a wasteful number, since it uses less digits than its factorization.

21502212514450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430044250301 (or 430044250296 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 34.

Adding to 21502212514450 its reverse (5441521220512), we get a palindrome (26943733734962).

The spelling of 21502212514450 in words is "twenty-one trillion, five hundred two billion, two hundred twelve million, five hundred fourteen thousand, four hundred fifty".