21122514 has 48 divisors (see below), whose sum is σ = 53307072. Its totient is φ = 5919264.

The previous prime is 21122473. The next prime is 21122561. The reversal of 21122514 is 41522112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5097 + ... + 8259.

It is an arithmetic number, because the mean of its divisors is an integer number (1110564).

Almost surely, 2^21122514 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21122514, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26653536).

21122514 is an abundant number, since it is smaller than the sum of its proper divisors (32184558).

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

21122514 is a wasteful number, since it uses less digits than its factorization.

21122514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3231 (or 3228 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 21122514 is about 4595.9236286083. The cubic root of 21122514 is about 276.4278964446.

Adding to 21122514 its reverse (41522112), we get a palindrome (62644626).

The spelling of 21122514 in words is "twenty-one million, one hundred twenty-two thousand, five hundred fourteen".