21196742 has 16 divisors (see below), whose sum is σ = 38250240. Its totient is φ = 8606088.

The previous prime is 21196733. The next prime is 21196751. The reversal of 21196742 is 24769112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21196733) and next prime (21196751).

It is a junction number, because it is equal to n+sod(n) for n = 21196699 and 21196708.

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, 39578 + ... + 40109.

It is an arithmetic number, because the mean of its divisors is an integer number (2390640).

Almost surely, 2^21196742 is an apocalyptic number.

21196742 is a deficient number, since it is larger than the sum of its proper divisors (17053498).

21196742 is a wasteful number, since it uses less digits than its factorization.

21196742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79715.

The product of its digits is 6048, while the sum is 32.

The square root of 21196742 is about 4603.9919635030. The cubic root of 21196742 is about 276.7513222981.

The spelling of 21196742 in words is "twenty-one million, one hundred ninety-six thousand, seven hundred forty-two".