21542202 has 24 divisors (see below), whose sum is σ = 50918400. Its totient is φ = 6527880.

The previous prime is 21542173. The next prime is 21542231. The reversal of 21542202 is 20224512.

It is an interprime number because it is at equal distance from previous prime (21542173) and next prime (21542231).

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 11 ways as a sum of consecutive naturals, for example, 54202 + ... + 54597.

It is an arithmetic number, because the mean of its divisors is an integer number (2121600).

Almost surely, 2^21542202 is an apocalyptic number.

21542202 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21542202 is an abundant number, since it is smaller than the sum of its proper divisors (29376198).

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

21542202 is a wasteful number, since it uses less digits than its factorization.

21542202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108818 (or 108815 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 21542202 is about 4641.3577754791. The cubic root of 21542202 is about 278.2467057633.

Adding to 21542202 its reverse (20224512), we get a palindrome (41766714).

It can be divided in two parts, 2154 and 2202, that added together give a square (4356 = 66²).

The spelling of 21542202 in words is "twenty-one million, five hundred forty-two thousand, two hundred two".