21770456523642 has 48 divisors (see below), whose sum is σ = 50232682192680. Its totient is φ = 6790467664896.

The previous prime is 21770456523611. The next prime is 21770456523653. The reversal of 21770456523642 is 24632565407712.

21770456523642 is a `hidden beast` number, since 2 + 1 + 7 + 7 + 0 + 4 + 56 + 523 + 64 + 2 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 20004159705201 + 1766296818441 = 4472601^2 + 1329021^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 205569267 + ... + 205675142.

Almost surely, 2^{21770456523642} is an apocalyptic number.

21770456523642 is an abundant number, since it is smaller than the sum of its proper divisors (28462225669038).

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

21770456523642 is a wasteful number, since it uses less digits than its factorization.

21770456523642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411244607 (or 411244604 counting only the distinct ones).

The product of its (nonzero) digits is 16934400, while the sum is 54.

The spelling of 21770456523642 in words is "twenty-one trillion, seven hundred seventy billion, four hundred fifty-six million, five hundred twenty-three thousand, six hundred forty-two".