21372034 has 8 divisors (see below), whose sum is σ = 32109840. Its totient is φ = 10668756.

The previous prime is 21372031. The next prime is 21372041. The reversal of 21372034 is 43027312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21371996 and 21372014.

It is not an unprimeable number, because it can be changed into a prime (21372031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7024 + ... + 9595.

It is an arithmetic number, because the mean of its divisors is an integer number (4013730).

Almost surely, 2^21372034 is an apocalyptic number.

21372034 is a deficient number, since it is larger than the sum of its proper divisors (10737806).

21372034 is a wasteful number, since it uses less digits than its factorization.

21372034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17264.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 21372034 is about 4622.9897252752. The cubic root of 21372034 is about 277.5121180759.

Adding to 21372034 its reverse (43027312), we get a palindrome (64399346).

The spelling of 21372034 in words is "twenty-one million, three hundred seventy-two thousand, thirty-four".