21400232151 has 8 divisors (see below), whose sum is σ = 28541701504. Its totient is φ = 14262792120.

The previous prime is 21400232137. The next prime is 21400232153. The reversal of 21400232151 is 15123200412.

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

It is not a de Polignac number, because 21400232151 - 2¹³ = 21400223959 is a prime.

It is a super-2 number, since 2×21400232151² (a number of 21 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 (21400232153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 994915 + ... + 1016196.

It is an arithmetic number, because the mean of its divisors is an integer number (3567712688).

Almost surely, 2^21400232151 is an apocalyptic number.

21400232151 is a deficient number, since it is larger than the sum of its proper divisors (7141469353).

21400232151 is a wasteful number, since it uses less digits than its factorization.

21400232151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2014661.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21400232151 its reverse (15123200412), we get a palindrome (36523432563).

The spelling of 21400232151 in words is "twenty-one billion, four hundred million, two hundred thirty-two thousand, one hundred fifty-one".