21122400143 has 16 divisors (see below), whose sum is σ = 23247845376. Its totient is φ = 19069071840.

The previous prime is 21122400137. The next prime is 21122400199. The reversal of 21122400143 is 34100422112.

It is not a de Polignac number, because 21122400143 - 2⁴ = 21122400127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122400133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 894458 + ... + 917768.

It is an arithmetic number, because the mean of its divisors is an integer number (1452990336).

Almost surely, 2^21122400143 is an apocalyptic number.

21122400143 is a deficient number, since it is larger than the sum of its proper divisors (2125445233).

21122400143 is a wasteful number, since it uses less digits than its factorization.

21122400143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24854.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21122400143 its reverse (34100422112), we get a palindrome (55222822255).

The spelling of 21122400143 in words is "twenty-one billion, one hundred twenty-two million, four hundred thousand, one hundred forty-three".