21770424342 has 12 divisors (see below), whose sum is σ = 47169252780. Its totient is φ = 7256808108.

The previous prime is 21770424293. The next prime is 21770424397. The reversal of 21770424342 is 24342407712.

21770424342 is a `hidden beast` number, since 217 + 7 + 0 + 4 + 2 + 434 + 2 = 666.

It is a super-2 number, since 2×21770424342² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21770424297 and 21770424306.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 604733992 + ... + 604734027.

It is an arithmetic number, because the mean of its divisors is an integer number (3930771065).

Almost surely, 2^21770424342 is an apocalyptic number.

21770424342 is an abundant number, since it is smaller than the sum of its proper divisors (25398828438).

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

21770424342 is a wasteful number, since it uses less digits than its factorization.

21770424342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1209468027 (or 1209468024 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 36.

The spelling of 21770424342 in words is "twenty-one billion, seven hundred seventy million, four hundred twenty-four thousand, three hundred forty-two".