21441402 has 16 divisors (see below), whose sum is σ = 47647680. Its totient is φ = 7147116.

The previous prime is 21441383. The next prime is 21441421. The reversal of 21441402 is 20414412.

It is an interprime number because it is at equal distance from previous prime (21441383) and next prime (21441421).

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198478 + ... + 198585.

It is an arithmetic number, because the mean of its divisors is an integer number (2977980).

Almost surely, 2^21441402 is an apocalyptic number.

21441402 is an abundant number, since it is smaller than the sum of its proper divisors (26206278).

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

21441402 is a wasteful number, since it uses less digits than its factorization.

21441402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397074 (or 397068 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 21441402 is about 4630.4861515828. The cubic root of 21441402 is about 277.8120375996.

Adding to 21441402 its reverse (20414412), we get a palindrome (41855814).

It can be divided in two parts, 214 and 41402, that added together give a triangular number (41616 = T₂₈₈).

The spelling of 21441402 in words is "twenty-one million, four hundred forty-one thousand, four hundred two".