21540577350 has 24 divisors (see below), whose sum is σ = 53420632200. Its totient is φ = 5744153920.

The previous prime is 21540577339. The next prime is 21540577361. The reversal of 21540577350 is 5377504512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21540577339) and next prime (21540577361).

It is a junction number, because it is equal to n+sod(n) for n = 21540577299 and 21540577308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71801775 + ... + 71802074.

It is an arithmetic number, because the mean of its divisors is an integer number (2225859675).

Almost surely, 2^21540577350 is an apocalyptic number.

21540577350 is an abundant number, since it is smaller than the sum of its proper divisors (31880054850).

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

21540577350 is a wasteful number, since it uses less digits than its factorization.

21540577350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143603864 (or 143603859 counting only the distinct ones).

The product of its (nonzero) digits is 147000, while the sum is 39.

The spelling of 21540577350 in words is "twenty-one billion, five hundred forty million, five hundred seventy-seven thousand, three hundred fifty".