21355456370762 has 4 divisors (see below), whose sum is σ = 32033184556146. Its totient is φ = 10677728185380.

The previous prime is 21355456370753. The next prime is 21355456370783. The reversal of 21355456370762 is 26707365455312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19599754519921 + 1755701850841 = 4427161^2 + 1325029^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21355456370698 and 21355456370707.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5338864092689 + ... + 5338864092692.

Almost surely, 2^{21355456370762} is an apocalyptic number.

21355456370762 is a deficient number, since it is larger than the sum of its proper divisors (10677728185384).

21355456370762 is a wasteful number, since it uses less digits than its factorization.

21355456370762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10677728185383.

The product of its (nonzero) digits is 31752000, while the sum is 56.

The spelling of 21355456370762 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred fifty-six million, three hundred seventy thousand, seven hundred sixty-two".