21277102 has 16 divisors (see below), whose sum is σ = 39791232. Its totient is φ = 8289720.

The previous prime is 21277063. The next prime is 21277117. The reversal of 21277102 is 20177212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

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, 68928 + ... + 69235.

It is an arithmetic number, because the mean of its divisors is an integer number (2486952).

Almost surely, 2^21277102 is an apocalyptic number.

21277102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21277102 is a deficient number, since it is larger than the sum of its proper divisors (18514130).

21277102 is a wasteful number, since it uses less digits than its factorization.

21277102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138183.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 21277102 is about 4612.7109165869. The cubic root of 21277102 is about 277.1006163955.

It can be divided in two parts, 2127 and 7102, that added together give a palindrome (9229).

The spelling of 21277102 in words is "twenty-one million, two hundred seventy-seven thousand, one hundred two".