21227530742 has 16 divisors (see below), whose sum is σ = 34799481792. Its totient is φ = 9631232520.

The previous prime is 21227530717. The next prime is 21227530747. The reversal of 21227530742 is 24703572212.

It is a super-2 number, since 2×21227530742² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21227530747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 869948 + ... + 894015.

It is an arithmetic number, because the mean of its divisors is an integer number (2174967612).

Almost surely, 2^21227530742 is an apocalyptic number.

21227530742 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21227530742 is a deficient number, since it is larger than the sum of its proper divisors (13571951050).

21227530742 is a wasteful number, since it uses less digits than its factorization.

21227530742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1764523.

The product of its (nonzero) digits is 47040, while the sum is 35.

The spelling of 21227530742 in words is "twenty-one billion, two hundred twenty-seven million, five hundred thirty thousand, seven hundred forty-two".