21401002 has 8 divisors (see below), whose sum is σ = 36687456. Its totient is φ = 9171852.

The previous prime is 21400997. The next prime is 21401047. The reversal of 21401002 is 20010412.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21401002.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 764308 + ... + 764335.

It is an arithmetic number, because the mean of its divisors is an integer number (4585932).

Almost surely, 2^21401002 is an apocalyptic number.

21401002 is a deficient number, since it is larger than the sum of its proper divisors (15286454).

21401002 is a wasteful number, since it uses less digits than its factorization.

21401002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528652.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 21401002 is about 4626.1217018146. The cubic root of 21401002 is about 277.6374429392.

Adding to 21401002 its reverse (20010412), we get a palindrome (41411414).

The spelling of 21401002 in words is "twenty-one million, four hundred one thousand, two".