21734431618650 has 48 divisors (see below), whose sum is σ = 53917371921504. Its totient is φ = 5794129990080.

The previous prime is 21734431618643. The next prime is 21734431618651. The reversal of 21734431618650 is 5681613443712.

It is a super-3 number, since 3×21734431618650³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21734431618593 and 21734431618602.

It is not an unprimeable number, because it can be changed into a prime (21734431618651) 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, 20972884 + ... + 21984783.

It is an arithmetic number, because the mean of its divisors is an integer number (1123278581698).

Almost surely, 2^{21734431618650} is an apocalyptic number.

21734431618650 is an abundant number, since it is smaller than the sum of its proper divisors (32182940302854).

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

21734431618650 is a wasteful number, since it uses less digits than its factorization.

21734431618650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42961055 (or 42961050 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 51.

The spelling of 21734431618650 in words is "twenty-one trillion, seven hundred thirty-four billion, four hundred thirty-one million, six hundred eighteen thousand, six hundred fifty".