821400888070 has 48 divisors (see below), whose sum is σ = 1794691725408. Its totient is φ = 269378672640.

The previous prime is 821400888023. The next prime is 821400888101. The reversal of 821400888070 is 70888004128.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a self number, because there is not a number n which added to its sum of digits gives 821400888070.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36430651 + ... + 36453190.

It is an arithmetic number, because the mean of its divisors is an integer number (37389410946).

Almost surely, 2^821400888070 is an apocalyptic number.

821400888070 is an abundant number, since it is smaller than the sum of its proper divisors (973290837338).

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

821400888070 is a wasteful number, since it uses less digits than its factorization.

821400888070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72883885 (or 72883878 counting only the distinct ones).

The product of its (nonzero) digits is 229376, while the sum is 46.

The spelling of 821400888070 in words is "eight hundred twenty-one billion, four hundred million, eight hundred eighty-eight thousand, seventy".