21742553770 has 32 divisors (see below), whose sum is σ = 44740626048. Its totient is φ = 7452408768.

The previous prime is 21742553761. The next prime is 21742553779. The reversal of 21742553770 is 7735524712.

It is an interprime number because it is at equal distance from previous prime (21742553761) and next prime (21742553779).

It is a zygodrome in base 4.

It is not an unprimeable number, because it can be changed into a prime (21742553779) 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, 205329 + ... + 292651.

It is an arithmetic number, because the mean of its divisors is an integer number (1398144564).

Almost surely, 2^21742553770 is an apocalyptic number.

21742553770 is an abundant number, since it is smaller than the sum of its proper divisors (22998072278).

21742553770 is a wasteful number, since it uses less digits than its factorization.

21742553770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90894.

The product of its (nonzero) digits is 411600, while the sum is 43.

The spelling of 21742553770 in words is "twenty-one billion, seven hundred forty-two million, five hundred fifty-three thousand, seven hundred seventy".