211421023400 has 24 divisors (see below), whose sum is σ = 491553879870. Its totient is φ = 84568409280.

The previous prime is 211421023343. The next prime is 211421023459. The reversal of 211421023400 is 4320124112.

It can be written as a sum of positive squares in 3 ways, for example, as 201786030436 + 9634992964 = 449206^2 + 98158^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 528552359 + ... + 528552758.

Almost surely, 2^211421023400 is an apocalyptic number.

211421023400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211421023400 is an abundant number, since it is smaller than the sum of its proper divisors (280132856470).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211421023400 is a wasteful number, since it uses less digits than its factorization.

211421023400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057105133 (or 1057105124 counting only the distinct ones).

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

Adding to 211421023400 its reverse (4320124112), we get a palindrome (215741147512).

The spelling of 211421023400 in words is "two hundred eleven billion, four hundred twenty-one million, twenty-three thousand, four hundred".