21136522 has 24 divisors (see below), whose sum is σ = 35124768. Its totient is φ = 9531720.

The previous prime is 21136519. The next prime is 21136523. The reversal of 21136522 is 22563112.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21136493 and 21136502.

It is not an unprimeable number, because it can be changed into a prime (21136523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40153 + ... + 40675.

It is an arithmetic number, because the mean of its divisors is an integer number (1463532).

Almost surely, 2^21136522 is an apocalyptic number.

21136522 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21136522 is a deficient number, since it is larger than the sum of its proper divisors (13988246).

21136522 is a wasteful number, since it uses less digits than its factorization.

21136522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714 (or 703 counting only the distinct ones).

The product of its digits is 720, while the sum is 22.

The square root of 21136522 is about 4597.4473352068. The cubic root of 21136522 is about 276.4889899663.

Adding to 21136522 its reverse (22563112), we get a palindrome (43699634).

The spelling of 21136522 in words is "twenty-one million, one hundred thirty-six thousand, five hundred twenty-two".