211220221000020 has 48 divisors (see below), whose sum is σ = 591661918507968. Its totient is φ = 56302030389760.

The previous prime is 211220221000007. The next prime is 211220221000027. The reversal of 211220221000020 is 20000122022112.

It is a super-2 number, since 2×211220221000020² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220221000027) 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, 729912789 + ... + 730202108.

It is an arithmetic number, because the mean of its divisors is an integer number (12326289968916).

Almost surely, 2^{211220221000020} is an apocalyptic number.

211220221000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211220221000020 is an abundant number, since it is smaller than the sum of its proper divisors (380441697507948).

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

211220221000020 is a wasteful number, since it uses less digits than its factorization.

211220221000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460117320 (or 1460117318 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 211220221000020 its reverse (20000122022112), we get a palindrome (231220343022132).

The spelling of 211220221000020 in words is "two hundred eleven trillion, two hundred twenty billion, two hundred twenty-one million, twenty", and thus it is an aban number.