21958102 has 4 divisors (see below), whose sum is σ = 32937156. Its totient is φ = 10979050.

The previous prime is 21958093. The next prime is 21958103. The reversal of 21958102 is 20185912.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21958103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5489524 + ... + 5489527.

It is an arithmetic number, because the mean of its divisors is an integer number (8234289).

Almost surely, 2^21958102 is an apocalyptic number.

21958102 is a deficient number, since it is larger than the sum of its proper divisors (10979054).

21958102 is a wasteful number, since it uses less digits than its factorization.

21958102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10979053.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 21958102 is about 4685.9472895029. The cubic root of 21958102 is about 280.0259414740.

The spelling of 21958102 in words is "twenty-one million, nine hundred fifty-eight thousand, one hundred two".