21011214500 has 48 divisors (see below), whose sum is σ = 45908099328. Its totient is φ = 8400895200.

The previous prime is 21011214493. The next prime is 21011214551. The reversal of 21011214500 is 541211012.

It is a super-2 number, since 2×21011214500² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1375907 + ... + 1391093.

It is an arithmetic number, because the mean of its divisors is an integer number (956418736).

Almost surely, 2^21011214500 is an apocalyptic number.

21011214500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011214500 is an abundant number, since it is smaller than the sum of its proper divisors (24896884828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21011214500 is a wasteful number, since it uses less digits than its factorization.

21011214500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17973 (or 17961 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 21011214500 its reverse (541211012), we get a palindrome (21552425512).

The spelling of 21011214500 in words is "twenty-one billion, eleven million, two hundred fourteen thousand, five hundred".