21512034 has 32 divisors (see below), whose sum is σ = 48185280. Its totient is φ = 7113600.

The previous prime is 21512033. The next prime is 21512053. The reversal of 21512034 is 43021512.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

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

It is a junction number, because it is equal to n+sod(n) for n = 21511998 and 21512016.

It is not an unprimeable number, because it can be changed into a prime (21512033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5554 + ... + 8594.

It is an arithmetic number, because the mean of its divisors is an integer number (1505790).

Almost surely, 2^21512034 is an apocalyptic number.

21512034 is an abundant number, since it is smaller than the sum of its proper divisors (26673246).

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

21512034 is a wasteful number, since it uses less digits than its factorization.

21512034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3183 (or 3177 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21512034 is about 4638.1067258096. The cubic root of 21512034 is about 278.1167582290.

Adding to 21512034 its reverse (43021512), we get a palindrome (64533546).

The spelling of 21512034 in words is "twenty-one million, five hundred twelve thousand, thirty-four".