21030515242 has 16 divisors (see below), whose sum is σ = 34417908000. Its totient is φ = 9558120240.

The previous prime is 21030515239. The next prime is 21030515257. The reversal of 21030515242 is 24251503012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131884 + ... + 243832.

It is an arithmetic number, because the mean of its divisors is an integer number (2151119250).

Almost surely, 2^21030515242 is an apocalyptic number.

21030515242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21030515242 is a deficient number, since it is larger than the sum of its proper divisors (13387392758).

21030515242 is a wasteful number, since it uses less digits than its factorization.

21030515242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120501.

The product of its (nonzero) digits is 2400, while the sum is 25.

The spelling of 21030515242 in words is "twenty-one billion, thirty million, five hundred fifteen thousand, two hundred forty-two".