21113146506450 has 48 divisors (see below), whose sum is σ = 52360970067360. Its totient is φ = 5630132968320.

The previous prime is 21113146506443. The next prime is 21113146506457. The reversal of 21113146506450 is 5460564131112.

It is an interprime number because it is at equal distance from previous prime (21113146506443) and next prime (21113146506457).

It is a junction number, because it is equal to n+sod(n) for n = 21113146506399 and 21113146506408.

It is not an unprimeable number, because it can be changed into a prime (21113146506457) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25575037 + ... + 26387663.

It is an arithmetic number, because the mean of its divisors is an integer number (1090853543070).

Almost surely, 2^{21113146506450} is an apocalyptic number.

21113146506450 is an abundant number, since it is smaller than the sum of its proper divisors (31247823560910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21113146506450 is a wasteful number, since it uses less digits than its factorization.

21113146506450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985851 (or 985846 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 39.

The spelling of 21113146506450 in words is "twenty-one trillion, one hundred thirteen billion, one hundred forty-six million, five hundred six thousand, four hundred fifty".