21771002530 has 16 divisors (see below), whose sum is σ = 39200158080. Its totient is φ = 8705655792.

The previous prime is 21771002479. The next prime is 21771002531. The reversal of 21771002530 is 3520017712.

It is a super-2 number, since 2×21771002530² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21771002531) 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, 309690 + ... + 373429.

It is an arithmetic number, because the mean of its divisors is an integer number (2450009880).

Almost surely, 2^21771002530 is an apocalyptic number.

21771002530 is a deficient number, since it is larger than the sum of its proper divisors (17429155550).

21771002530 is a wasteful number, since it uses less digits than its factorization.

21771002530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686313.

The product of its (nonzero) digits is 2940, while the sum is 28.

The spelling of 21771002530 in words is "twenty-one billion, seven hundred seventy-one million, two thousand, five hundred thirty".