21542026 has 32 divisors (see below), whose sum is σ = 37635840. Its totient is φ = 9139200.

The previous prime is 21541979. The next prime is 21542063. The reversal of 21542026 is 62024512.

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 = 21541988 and 21542006.

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, 89266 + ... + 89506.

It is an arithmetic number, because the mean of its divisors is an integer number (1176120).

Almost surely, 2^21542026 is an apocalyptic number.

21542026 is a deficient number, since it is larger than the sum of its proper divisors (16093814).

21542026 is a wasteful number, since it uses less digits than its factorization.

21542026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 21542026 is about 4641.3388154712. The cubic root of 21542026 is about 278.2459480018.

Adding to 21542026 its reverse (62024512), we get a palindrome (83566538).

The spelling of 21542026 in words is "twenty-one million, five hundred forty-two thousand, twenty-six".