31401401220 has 120 divisors (see below), whose sum is σ = 112579879104. Its totient is φ = 7177460544.

The previous prime is 31401401183. The next prime is 31401401249. The reversal of 31401401220 is 2210410413.

31401401220 is a `hidden beast` number, since 3 + 1 + 40 + 1 + 401 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31401401193 and 31401401202.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1373202 + ... + 1395881.

Almost surely, 2^31401401220 is an apocalyptic number.

31401401220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31401401220 is an abundant number, since it is smaller than the sum of its proper divisors (81178477884).

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

31401401220 is a wasteful number, since it uses less digits than its factorization.

31401401220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2769111 (or 2769100 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 31401401220 its reverse (2210410413), we get a palindrome (33611811633).

The spelling of 31401401220 in words is "thirty-one billion, four hundred one million, four hundred one thousand, two hundred twenty".