21130397770 has 16 divisors (see below), whose sum is σ = 38102283360. Its totient is φ = 8437144144.

The previous prime is 21130397767. The next prime is 21130397773. The reversal of 21130397770 is 7779303112.

It is an interprime number because it is at equal distance from previous prime (21130397767) and next prime (21130397773).

It is not an unprimeable number, because it can be changed into a prime (21130397773) 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, 1870960 + ... + 1882219.

It is an arithmetic number, because the mean of its divisors is an integer number (2381392710).

Almost surely, 2^21130397770 is an apocalyptic number.

21130397770 is a deficient number, since it is larger than the sum of its proper divisors (16971885590).

21130397770 is a wasteful number, since it uses less digits than its factorization.

21130397770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3753749.

The product of its (nonzero) digits is 55566, while the sum is 40.

The spelling of 21130397770 in words is "twenty-one billion, one hundred thirty million, three hundred ninety-seven thousand, seven hundred seventy".