20211220410 has 32 divisors (see below), whose sum is σ = 48517607232. Its totient is φ = 5388472320.

The previous prime is 20211220391. The next prime is 20211220411. The reversal of 20211220410 is 1402211202.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20211220410.

It is not an unprimeable number, because it can be changed into a prime (20211220411) 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, 68922 + ... + 212538.

It is an arithmetic number, because the mean of its divisors is an integer number (1516175226).

Almost surely, 2^20211220410 is an apocalyptic number.

20211220410 is an abundant number, since it is smaller than the sum of its proper divisors (28306386822).

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

20211220410 is a wasteful number, since it uses less digits than its factorization.

20211220410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148318.

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

Adding to 20211220410 its reverse (1402211202), we get a palindrome (21613431612).

The spelling of 20211220410 in words is "twenty billion, two hundred eleven million, two hundred twenty thousand, four hundred ten".