21451143031 has 8 divisors (see below), whose sum is σ = 22968178560. Its totient is φ = 19962463488.

The previous prime is 21451143029. The next prime is 21451143037. The reversal of 21451143031 is 13034115412.

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

It is a cyclic number.

It is not a de Polignac number, because 21451143031 - 2¹ = 21451143029 is a prime.

It is a super-2 number, since 2×21451143031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21451142987 and 21451143005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21451143037) 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, 7087431 + ... + 7090456.

It is an arithmetic number, because the mean of its divisors is an integer number (2871022320).

Almost surely, 2^21451143031 is an apocalyptic number.

21451143031 is a deficient number, since it is larger than the sum of its proper divisors (1517035529).

21451143031 is a wasteful number, since it uses less digits than its factorization.

21451143031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14177993.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 21451143031 its reverse (13034115412), we get a palindrome (34485258443).

The spelling of 21451143031 in words is "twenty-one billion, four hundred fifty-one million, one hundred forty-three thousand, thirty-one".