1011621420 has 192 divisors, whose sum is σ = 3355914240. Its totient is φ = 252400896.

The previous prime is 1011621407. The next prime is 1011621461. The reversal of 1011621420 is 241261101.

1011621420 is a `hidden beast` number, since 1 + 0 + 1 + 1 + 621 + 42 + 0 = 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 = 1011621393 and 1011621402.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 582874 + ... + 584606.

It is an arithmetic number, because the mean of its divisors is an integer number (17478720).

Almost surely, 2^1011621420 is an apocalyptic number.

1011621420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1011621420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1677957120).

1011621420 is an abundant number, since it is smaller than the sum of its proper divisors (2344292820).

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

1011621420 is a wasteful number, since it uses less digits than its factorization.

1011621420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821 (or 1813 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 1011621420 is about 31805.9966044141. The cubic root of 1011621420 is about 1003.8588964306.

Adding to 1011621420 its reverse (241261101), we get a palindrome (1252882521).

The spelling of 1011621420 in words is "one billion, eleven million, six hundred twenty-one thousand, four hundred twenty".