21354770338 has 24 divisors (see below), whose sum is σ = 35775791856. Its totient is φ = 9480958200.

The previous prime is 21354770317. The next prime is 21354770363. The reversal of 21354770338 is 83307745312.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a junction number, because it is equal to n+sod(n) for n = 21354770294 and 21354770303.

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, 221808 + ... + 303163.

It is an arithmetic number, because the mean of its divisors is an integer number (1490657994).

Almost surely, 2^21354770338 is an apocalyptic number.

21354770338 is a deficient number, since it is larger than the sum of its proper divisors (14421021518).

21354770338 is a wasteful number, since it uses less digits than its factorization.

21354770338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525070 (or 525027 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 43.

The spelling of 21354770338 in words is "twenty-one billion, three hundred fifty-four million, seven hundred seventy thousand, three hundred thirty-eight".