21011642254 has 8 divisors (see below), whose sum is σ = 31765632768. Its totient is φ = 10423098000.

The previous prime is 21011642237. The next prime is 21011642257. The reversal of 21011642254 is 45224611012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21011642254² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011642257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41361247 + ... + 41361754.

It is an arithmetic number, because the mean of its divisors is an integer number (3970704096).

Almost surely, 2^21011642254 is an apocalyptic number.

21011642254 is a deficient number, since it is larger than the sum of its proper divisors (10753990514).

21011642254 is a wasteful number, since it uses less digits than its factorization.

21011642254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82723130.

The product of its (nonzero) digits is 3840, while the sum is 28.

The spelling of 21011642254 in words is "twenty-one billion, eleven million, six hundred forty-two thousand, two hundred fifty-four".