21226740202151 has 4 divisors (see below), whose sum is σ = 23156443856904. Its totient is φ = 19297036547400.

The previous prime is 21226740202141. The next prime is 21226740202153. The reversal of 21226740202151 is 15120204762212.

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

It is a cyclic number.

It is not a de Polignac number, because 21226740202151 - 2¹⁴ = 21226740185767 is a prime.

It is a super-2 number, since 2×21226740202151² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21226740202153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 964851827360 + ... + 964851827381.

It is an arithmetic number, because the mean of its divisors is an integer number (5789110964226).

Almost surely, 2^{21226740202151} is an apocalyptic number.

21226740202151 is a deficient number, since it is larger than the sum of its proper divisors (1929703654753).

21226740202151 is a wasteful number, since it uses less digits than its factorization.

21226740202151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1929703654752.

The product of its (nonzero) digits is 26880, while the sum is 35.

Adding to 21226740202151 its reverse (15120204762212), we get a palindrome (36346944964363).

The spelling of 21226740202151 in words is "twenty-one trillion, two hundred twenty-six billion, seven hundred forty million, two hundred two thousand, one hundred fifty-one".