21000242510 has 48 divisors (see below), whose sum is σ = 41425264944. Its totient is φ = 7660463616.

The previous prime is 21000242507. The next prime is 21000242513. The reversal of 21000242510 is 1524200012.

It is an interprime number because it is at equal distance from previous prime (21000242507) and next prime (21000242513).

It is a super-3 number, since 3×21000242510³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000242513) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65414 + ... + 215126.

It is an arithmetic number, because the mean of its divisors is an integer number (863026353).

Almost surely, 2^21000242510 is an apocalyptic number.

21000242510 is a deficient number, since it is larger than the sum of its proper divisors (20425022434).

21000242510 is a wasteful number, since it uses less digits than its factorization.

21000242510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149829 (or 149816 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

Adding to 21000242510 its reverse (1524200012), we get a palindrome (22524442522).

The spelling of 21000242510 in words is "twenty-one billion, two hundred forty-two thousand, five hundred ten".