21770740452 has 48 divisors (see below), whose sum is σ = 52822506240. Its totient is φ = 6970349568.

The previous prime is 21770740451. The next prime is 21770740463. The reversal of 21770740452 is 25404707712.

It is a self number, because there is not a number n which added to its sum of digits gives 21770740452.

It is not an unprimeable number, because it can be changed into a prime (21770740451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94908 + ... + 229235.

It is an arithmetic number, because the mean of its divisors is an integer number (1100468880).

Almost surely, 2^21770740452 is an apocalyptic number.

It is an amenable number.

21770740452 is an abundant number, since it is smaller than the sum of its proper divisors (31051765788).

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

21770740452 is a wasteful number, since it uses less digits than its factorization.

21770740452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324372 (or 324370 counting only the distinct ones).

The product of its (nonzero) digits is 109760, while the sum is 39.

The spelling of 21770740452 in words is "twenty-one billion, seven hundred seventy million, seven hundred forty thousand, four hundred fifty-two".