21961142 has 16 divisors (see below), whose sum is σ = 37739520. Its totient is φ = 9388968.

The previous prime is 21961129. The next prime is 21961151. The reversal of 21961142 is 24116912.

It is a super-3 number, since 3×21961142³ (a number of 23 digits) contains 333 as substring.

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, 4859 + ... + 8217.

It is an arithmetic number, because the mean of its divisors is an integer number (2358720).

Almost surely, 2^21961142 is an apocalyptic number.

21961142 is a deficient number, since it is larger than the sum of its proper divisors (15778378).

21961142 is a wasteful number, since it uses less digits than its factorization.

21961142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3835.

The product of its digits is 864, while the sum is 26.

The square root of 21961142 is about 4686.2716523906. The cubic root of 21961142 is about 280.0388636531.

The spelling of 21961142 in words is "twenty-one million, nine hundred sixty-one thousand, one hundred forty-two".