211421212040 has 64 divisors (see below), whose sum is σ = 478047564720. Its totient is φ = 84151296000.

The previous prime is 211421212033. The next prime is 211421212043. The reversal of 211421212040 is 40212124112.

It can be written as a sum of positive squares in 8 ways, for example, as 166051360036 + 45369852004 = 407494^2 + 213002^2 .

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

It is not an unprimeable number, because it can be changed into a prime (211421212043) 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, 13304900 + ... + 13320780.

Almost surely, 2^211421212040 is an apocalyptic number.

211421212040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211421212040 is an abundant number, since it is smaller than the sum of its proper divisors (266626352680).

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

211421212040 is a wasteful number, since it uses less digits than its factorization.

211421212040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17514 (or 17510 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 211421212040 its reverse (40212124112), we get a palindrome (251633336152).

The spelling of 211421212040 in words is "two hundred eleven billion, four hundred twenty-one million, two hundred twelve thousand, forty".